That sounds beautiful! Places like Prairie Moon Nursery sell seed in bulk, but it's better to find local sources if possible. iNaturalist can be good for this. You'd have to look up when they go to seed and be mindful not to over harvest.

Personally, I would test the waters with landscapers using common blue violets and native wood sorrels since they aggressively spread themselves. They can handle a wide variety of conditions and mowing.

Since you're so close, I say give something on the list a try. Plants don't pay attention to our maps anyway :) There's a search bar at the bottom of the page for each ecoregion where you can plug in the plant name to see if it pops up.

I'm further south than you near the Chesapeake Bay, so hopefully someone else swings by for more specific advice. I do stick by the common blue violet and native wood sorrell suggestion, especially if the area is mowed. Start small and see what sticks, experimenting is part of the process!