Student solo spinning sounds like asking for trouble to me. I see no requirement for it, and a spin is still not an entirely safe manoeuvre for the inexperienced, even if correctly taught. Again referring to UK military flying training, although the course involved the student practicing the spin many times, intentional spinnning was the only part of the VFR flying that was taught (or taught officially - there were some unauthorised aerobatic manoeuvres flown that I would not have dared solo!) but never practised solo.