The 120VAC 1075RPM motors sound good.
The 32V may or may not be OK (but not great), depending on if it contains magnets. The blades will need to be short and fast. The low power rating may keep the blades from stalling. If it works the output will be low. My luck has not been good.
The treadmill motor sounds too high speed to me. 12V cutin around 700RPMs, maybe more.
(12V / 90V = 0.1333 0.1333 x 5200RPM = 700RPM before 12V is reached)
Worst case, remove the coils (copper prices are crazy high), take them to the scrap dealer, use the money to buy neo magnets for the 120V 1075RPM motors.
G-