But to keep this on topic, if you're sending someone off to practice asymmetric flight at a safe height, would you not also want to know that they could recover from an unintentional spin? A PA38, if stalled with crossed contols, won't give much warning before it bites & although I've never spun one with the flaps down, I'd expect you'd need to get them retracted smartish to avoid overstressing in the recovery.
Sounds like you are getting mixed up here - Asymmetric flight is flying a twin on one engine, not flying crossed controls!