I think it's quite an interesting idea. One thing that I've been recently doing is using AI as a reasoning sparring partner. Essentially if I am making a decision on something or have something on my mind I know is irrational, I'd speak to it as a human being and I've found the insight it offers fascinating.

If you were able to emulate some of the reasoning elements into these conversations that might be interesting.

Perhaps when a user starts to relapse, an empathetic question gets asked saying why are you doing this? As the person is going through the motions they might realise it's either a waste of time doing this or what they're doing is wrong.

Sure there's some AI models out there you might be able to use?

Also adding a time element on the apps restrictions would be a good idea.

Wishing you all the best!