I have four Couch's (1 male, 3 females). I've never been able to get them to breed. The only spadefoots I've had that seem to even be remotely interested in breeding in captivity are my New Mexico Spadefoots. My male always knows when it's summer time and he comes out and serenades me all night. My female never lays eggs, though. They just end up having "fun".

The main problem I think you will find trying to breed them is that they need to follow their natural cues. Since spadefoots spend 10+ months in aestivation, I'm assuming you would need to get them to stay in their burrows for that length of time where they wouldn't eat and basically be in a cocoon. I'm not certain how you would artificially create that in captivity. My main worry would be that they wouldn't get enough water in their burrows and they'd dry out. I've had spadefoots for years, and they never go into aestivation. It might be because they have a steady supply of water and food.

I'd do a little research on how to force them into aestivation. That might be a good place to start.

Good luck! Let me know how it goes.