Only a suicidal idiot would enter a deliberate spin below 5000ft AGL.
How many T67s have spun in doing competition aeros?
Top of the box wouldn't be more than 3500' agl. Granted they're not intending to do more than a couple of turns, but still.
I did, in BONZO. I normally started at 3500ft, the spin was always early in the sequences that I did during my short foray in to aerobatic competition, so 3000ft for entry, anything below and I'd can it, and did do. It's a few years since I've flown, but I do remember some wise words that came my way, "one day, you'll put in the inputs to recover the spin and it won't recover as you expect, don't start £$%"£$"£ about with it, stick with it and it will drop out" It did it once and completed another rotation and then dropped out. I don't know why, but it did. From memory the FF's are not cleared for inverted spinning, but I had instruction on how to recover from that as well, should it happen. I always flew with a chute just in case.
If/When time and money allows and the kids stop bleeding me dry, I'll start flying again, and I would quite happily fly a FF.