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Went to bleed my brakes yesterday with Mightvac and everything was going well bled the 2 drum's with no problem it worked like a charm but when I got to PS caliper I broke the damn bleed screw off! I even used PB blast because I knew it might be rusted but obviously didn't work. Luckily it broke closed but I can't bleed the line now! I couldn't even crack the DS caliper bleed screw either. I know I can replace the bleed screws (Just above $4 for pack of 10 on rockauto.com) or get speedbleeders but the end of the broke bleed screw is in there so tight not even penetrating oil and some tight vice grips would make it budge. Can eventually just replace the caliper's inexpensively (and paint them at them at the same time) but anyone have any other advice? I would love to get front GS calipers/discs and rear disc swap but that will be in the future.

At this point you can drill and tap them for an oversized bleeder, otherwise if theres enough of a tip left Ive had good luck heating the caliper backside with a torch and cooling it for few cycles before braking them loose

Could try an easy-out or reverse drill bit.