The best way to prevent late tomato blight is to make SURE that no water splashes up from the soil onto your plants. This is more difficult than it sounds...you've got spores everywhere now since you allowed the tomatoes to be eaten. Doesn't matter that you've planted tomatoes in a different spot, consider all your soil (and your neighbor's) now have spores.
I would mulch the top of the soil beneath your tomatoes (with soil-less mulch, ie. straw), build a mini-hoop house over the top and prune all leaves that are 12" or less from the ground. Minimum. All it takes is ONE spore, ONE drop of water landing on the leaves (last I read the stem is 50/50) and the entire plant is infected and unusable. Have no idea if the fruit is toxic, I doubt it, but it will continue to blacken even if preserved.
But, I appreciate you allowing the tomatoes to be eaten by the wildlife!! I grew tomatoes in soil no one had grown a garden much less tomatoes for miles. And I lost at least 30 huge plants full of tomatoes. From the very first spots to totally black...3 days!
Fungicides only work if you've sprayed them PRIOR to infection. But although I've tried this, using NEEM, can't stand the smell much less the thought of eating them. Think of fungicides acting as a sort of raincoat. But once the tomatoes have been infected, there is NOTHING you can do to stop the infection.
Bamboo's advice is correct, just thought I'd add a few more thoughts...