Good discussion...
I still cannot see how one is going to get into a spin - base to final turn excepted - without doing something really careless.
Actually there is another way and that is probing the operating ceiling, and as your IAS falls (due to lack of power etc) towards Vs, then you have a stall condition. That would be around FL220 for the SR22.
The focus on spins (now removed from the PPL) would have been better spent teaching pilots to fly in a more deliberate fashion... always trim for a specific speed especially when flying below cruise speed (i.e. in the circuit) and be very careful. I was never taught to trim during my PPL training; only afterwards I discovered that the trim really controls the aircraft speed, and how doing it right reduces pilot workload.
Also an understanding of how Vs varies with wing loading would help - you can do really steep turns at low speeds if you couple that with unloading the wings during the turn (this means losing height).