What size wrench is the bleeder? Mine was stripped really bad so I just took the next size smaller wrench and hammered it on. Broke loose like that and then I went and got new bleeder screws.
If you have clearnance, a Bolt-out might work for ya.
I used to remove them with vice-grips too.
The combination of galvanic corrosion, pot metal head on the bleeder and hygroscopy in the system can really seize the bleeders in there.