This is not really an answer to your question, but may be a step towards an answer.
If you want a plant guild adapted to your area that contains Prunus species, you may want to look at your local forest to understand how it is put together and where Prunus species fit into it. In Vegetation of Wisconsin, John T. Curtis measured the prevailance of plant species in the major plant communities in the state of Wisconsin. Your local forest is an eastern extension of a forest the Curtis called the northern dry-mesic forest. The forest in your area will likely contain all the species of its Wisconsin counterpart plus a few additional, in particular, a greater variety of ferns.
A northern dry-mesic forest in Wisconsin would have as dominant canopy species: Pinus strobus (White Pine), Acer rubrum (Red Maple), Quercus rubra (Northern Red Oak), Betula papyrifera (Paper Birch), and Acer saccharum (Sugar Maple). Unlike New Hampshire, Fagus grandifolia (Beech) is well down the list since it has hardiness issues in many areas of Wisconsin.
The two Prunus in the forest, P. serotina (Black Cherry) and P. pennsylvanica (Pin Cherry), are not very shade tolerant. So they also not major dominants. Pin Cherry is primarily a forest edge species since it is small. While P. serotina also appears at the edge and in openings, it also scatters large numbers of seedlings across the shady forest floor to wait for a large tree to die. If so blessed, one of the cherry seedlings will take the dead tree's place. So P. serotina regularly appears as a canopy tree. The similarly handicapped bitternut hickory (Carya cordiformis) uses the same stealthily approach to finding a place in this forest.
The following is a list of the major ground-layer species ranked according to their frequency of appearance:
Genus Species Common Name Frequency
TREES & SHRUBS
Diervilla lonicera Northern Bush Honeysuckle 11.2 Weigelia relative
Rubus allegheniensis Allegheny Blackberry 8.3 Forest edge shrub
Vaccinium angustifolium Low-bush Blueberry 8.2 Forest edge shrub
Rubus pubescens Dwarf Red Raspberry 5.6 Forest edge shrub
Viburnum acerifolium Maple-leaf Viburnum 5.4 Understory shrub
Rubus strigosus American Red Raspberry 4.5 Forest edge shrub
Cornus alternifolia Pagoda Dogwood 1.4 Understory, forest edge tree
Ostrya virginiana Ironwood 1.2 Forest edge, understory tree
Ribes cynosbati Eastern Prickly Gooseberry 1.0 Forest edge shrub. Tasty
Lonicera oblongifolia Swamp Fly Honeysuckle .9 Understory, forest edge shrub
Amelanchier Serviceberry .2 Forest edge tree
Carpinus caroliniana American Hornbeam .1 Understory tree
Hamamelis virginiana Common Witchhazel .0 Understory shrub
Viburnum rafinesquianum Downy Arrowwood .0 Understory shrub
Maianthemum canadense Canada Mayflower 50.1 Dominant understory plant !
Eurybia macrophyllus Large Leaf Aster 35.7 Formerly Aster macrophyllus
Anemone quinquefolia Wood Anemone 18.1
Mitchella repens Partridgeberry 15.2 Replacement for Vinca minor
Clintonia borealis Blue-bead Lily 12.5 Similar to Erythronium
Polygonatum pubescens Hairy Solomon's Seal 12.3
Galium triflorum Fragrant Bedstraw 11.7 Similar to G. odoratum
Lycopodium obscurum Ground-Pine, Clubmoss 9.3 Cool soil
Trillium grandiflorum Large-flowered Trillium 8.0
Cornus canadensis Bunchberry 5.6 Cool Soil
Osmorhiza claytonii Downy Sweet Cicily 5.0 Scent of licorice
Dryopteris carthusiana Spinulose Wood Fern 3.4 Fern
Prenanthes alba White Rattlesnake Root 1.7
Chimaphila umbellata Pipsissewa 1.4 Hard to Grow
Actaea pachypoda White Baneberry 1.0
SUN & PARTIAL SHADE GROUP
Pteridium aquilinum Common Bracken Fern 28.4 Fern
Aralia nudicaulis Wild Sarsaparilla 26.1 The root beer plant
Oryzopsis asperifolia Canada Rice Grass 22.6 Grass
Trientalis borealis Starflower 21.4
Uvularia sessilifolia Sessile Bellwort 14.3
Carex pennsylvanica Pennsylvania Sedge 9.5 Sedge
Maianthemum racemosum False Solomon's Seal 8.7
Gaultheria procumbens Wintergreen 6.6
Fragaria virginiana Virginia Strawberry 6.0
Polygala paucifolia Gaywings 5.8
Pyrola elliptica Waxflower Shinleaf 5.1
Viola cucullata Marsh Blue Violet 4.5
Orthilia secunda Sidebells Wintergreen 4.0
Viola pubescens Downy Yellow Violet 3.3
Toxicodendron radicans Poison Ivy 3.2
Sanicula odorata Clustered Black Snakeroot 2.7
Aquilegia canadensis Eastern Red Columbine 1.8
Apocynum androsaemifolium Dog Bane 1.7 Milkweed relative
Pyrola americana Round-leaved Pyrola 1.7
Brachyetrum erectum Long-Awned Wood Grass 1.5 Grass
Waldstienia fragarioides Barren Strawberry .3
Clematis occidentalis Purple Clematis .0
Medeola virginiana Indian Cucumber-root .0 Edible root
Interestingly, there does not appear to be any nitrogen fixing plants in either the canopy or ground layer. Alder (Alnus viridis) does fix nitrogen, and, though it was observed in the somewhat drier and pine dominated northern dry forest, even there, it was rare (seen in one of thirty-eight stands).
The next step in developing your plant guild would, I suppose, be to figure out the ecological purpose of some of the plants present so that you can decide whether to include those plants or something similar in your guild.
Edit. Corrected some plant names above and added some observations:
I notice that among the top five or six ground-layer species there is a large variation in bloom time, running from early spring to early autumn. I am guessing this is due to competition for pollinators. I see this issue in my herb garden. Normally, thyme and chive flowers are quite attractive to bees. However, when the fennel is in bloom, they couldn't be bothered. Hence, you may want to take care that the bloom time of plants whose fruit you want does not overlap with others. At the same time, it may be wise to see that there is always something in bloom so that pollinators will choose to take up residence in nearby.
The ground-layer species in this forest, mostly, are not good ground covers. They either intertwine a couple-three species to cover the ground or they depend on leaf mulch. If you based your guild on this forest, you will likely need to need to add a layer of mulch each fall.
That said, there are a few species that do behave like traditional vigorous, tight ground covers: Diervilla, Mitchella, Gaultheria, Waldstienia, and Clematis.
Finally, it is curious how many of fruits in the understory tree and shrub layer seem so delicious. With only two exceptions, all the fruits are shrub layer fruit are very attractive to wildlife. I imagine that all of these plants are opportunists the way black cherry and butternut hickory are, spreading their seed far and wide in hopes that there will be an opening for them somewhere.