If you want to do a little searching on TEG, you will find
@seedcorn 's suggestion, which I tried for the 2 seasons that I grew Painted Mountain, on how to make use of a flour corn if you don't have a mill. ~ Soak seeds overnight and use a blender ~
Painted Mountain made delicious cornbread. I'm not kidding! I wish that I was still able to grow it

. Where I have room for corn, the neighbor has so much sweetcorn planted nearby that crossing with his sweetcorn would be very likely.
About the 3 Sisters. It's just perfection with a flour corn, pole beans for dry use, and a big, sprawling squash, IMHO. The problem when I first tried it was harvesting and the collapsing sweetcorn plants - terrible! Using Painted Mountain, even tho they tend to be small plants, with a few tall stakes for the beans, worked fine.
I don't find driving stakes for beans much trouble. I'm out there with a milk crate to stand on and a 5# sledgehammer. Vertical and early enough that I didn't have trouble from the squash vines.
In 2021, I planted a squash with very
vigorous vining tendencies a little too close to the teepee type arrangements made for the Rattlesnake Beans (not with any corn plants). The squash found it too easy to make use of the slanting pole bean trellis and started up one side. They didn't really make a lot of trouble but they slowed things down for the beans after the squash had crawled over that far ...
Steve