Not to take away from your deer, but I wonder what those beats would do in corn. I'd say broadcasting them right after the corn is sprayed, which is usually the end of Juneish in my parts.
I'm done with corn in my sand, it's just a lost cause with these yearly droughts it seems we get. I've always wanted to broadcast rye into corn at this time, that would be fool proof. Rye can handle some pretty heavy shade, and it doesn't seem to get as dark in corn as some nice beans.
On another note, I've seen some pretty impressive snap beans planted into glyphosate suppressed alfalfa.
Do you have a 3 pt spreader, with all the broadcasting you do? I'm in the market for the right one, just gotta get it at the right price.
Keep us updated on all your trials, this sort of stuff is cutting edge.