[old_tv_nut]

It should work (although I agree don't do it unless you need to). Only thing to watch for, I think, would be the B+ going up due to less loading, but you could fix that with an appropriate added power resistor to load it down again.

Edit: if you do use separate HV and sweeps, there is a danger of sweep failing and HV staying up, which I think could burn a nice mark into your expensive or unobtainable CRT.