I do not think it would be worth adapting.You want the rotor to be spinning and set your cutting bits at just touching the rotor and then set the feed motor to start feed out.If That makes any sense...
Seeing your machine and the pulley setup only the top spins.
Man, You probably can make some neat stuff with that.
What have you made with it?
Just make something for someone that has a brake lathe and trade...
Most shops and auto parts around here charge $15.00 a rotor.
Martin