I am in. This is the kind of crazy thing I keep trying to come up with, so I would be remiss if I did not back up a fellow crazy system-builder.
Anyway, I love the explanation of the logic behind your choices, and the only suggestion I would make is to leave open the possibility that after 13 seasons we might want to keep going, in which case I would suggest expanding back outward, going from 1965/69 convergence to 1962/72, then 1959/75, and so on or something like that to continue the league.
But I like it. Let's hope some more sign up.