If there was a simple, non-kyc solution to get people bitcoin from an in app purchase im sure we would have done it already.
Discussion
My point is that you've never enabled in-app purchase. (Why you haven't is another story, and I'm with you on the philosophical side, but still another story.)
And since it's the most sledgehammer obvious thing, you can't not do it and then be surprised that the submission failed.
I'd bet my hat that somewhere in your inbox is an email from Apple telling you in very clear terms to enable in-app purchase of zaps as a means of having the zap feature approved. There has to be.