Hmm, not as far as I know. I didn't know deca was bad for hair, but I haven't really looked into deca. Propecia would be an effective prohylactic, but there are lots of complaints of lost libido and impotence associated with it, even after stopping.
Also, with T + var, you'd have to run the T higher than 200mg/wk to get good results, and the T conversion to DHT is the hair killer.