Any tricks to removing a stuck/stubborn/rusted-in place bleeder?

I'm trying to get Bazza's VG to MITP next month, but one of the issues with driving it there is that the front brakes are "so-so" at best, and I can't bleed them, as the bleeders are stuck in the calipers. When it was here last summer I ran out of time, and money, but I did try bleeding the brakes when I got everything else done. Only problem is, I could literally see the bleeder twisting as I tried to loosen it up, and since his car uses Sterling calipers and discs/rotors (IOW, NLA and big $$$), I didn't want to risk breaking the bleeder and/or stripping out the caliper.

I did try soaking the bleeders with some JB-80 "luber-schlider", but that didn't seem to help.

I know Bazza would really like to drive his car to MITP, so does anyone know of a handy way to break open stuck/rusted brake bleeders?

Thanks.

Jim