Buckwheat is a smother crop if planted at normal rates, I wouldn't advise using that. Oats will work.
I planted the hillside in front of my house in a pollinator mix using oats and broadcasting-
Figured out sq footage, weighed oats for normal planting rates.
Put the oats in a 5 gallon bucket, mist with hose so they're damp but not drenched.
Dump pollinator seeds into bucket and mix well.
Pollinators will stick to the oats and be able to be broadcasted from Solo spreader or similar.
I covered in straw for erosion control but not necessary.
Mow oats before seeds become viable.
You may want to rough up the soil to get a better catch on your seeding, I'd recommend dragging or something similar. Definitely wouldn't till.
Second year after planting, hillside on bottom of image.
