I have, by dint of an underground service that needed to be serviced which was under my blueberry bed, transplanted the entire bed some years after it was established (more than 2.)
While they probably would have been happier left alone, they were minimally impacted for all that. I basically raked off the mulch, dug up each plant with as much root mass still in soil as I could manage, set that aside, transferred as much of the acid soil to the new location as was practicable, loaded the plant into the wheelbarrow and replanted it in the acid soil in the new location (minimizing the time the plant was displaced) remulched, and watered well (but not too much) for a few weeks.
In your case rather than "push under" (which seems prone to voids, to me) I'd get the pile of new dirt ready, skid the plant out of the way, set the new dirt, and replace the plant. Or, move the rows sideways (pile up the new dirt, move the plants onto it.)
I would not suggest using rotting fruit - let that finish composting before applying it to plants. A sandy soil (under the shallow root zone, which should be high in humus) would be a good choice for drainage and considering where blueberries seem to be happy in the wild.
If terrain allows, another option to improve drainage (with no root disturbance) would be a ditch all around the blueberry bed, draining away from it.