yeah i think it will work because the bottom of the Keg has a dip in it.....not much of one but I would guess it would work. The best bet is to call em and ask
I'm pretty sure a keg is bigger than 10" in diameter, so the false bottom isn't big enough. Also, are you going to actually weld a bulkhead/ball valve to the keg, or do you want a weldless fitting?
Talk to JAYBIRD, a member on here that makes false bottoms. He'll help you out, even if you don't buy from him, but he also has the best prices in false bottoms: