I'm not sure how many one lizard would eat in a weeks time or up to what size.
You would just allow your adults to breed, no need to feed them off. If you took the nymphs out a kept them at a cooler temp, they would grow pretty slow. The smaller they are the more you would feed off.
I think it takes about 6 months for them to reach adult size (that's off the top of my head)
I think once you had a system, knowing the numbers you need, you could control it so it doesn't get out of hand.

If you want to just try some small ones as feeders first, shoot me a PM

This is coming from a person that hated roaches as well :p