You provide the most interesting of problems!
:-)
As a shamefully abherent bandaid something, I'd back out the bleeder screw,
and push that brake pedal with my foot, hoping to blow whever is in there out.
Then I'd go back to bleeding that caliper. Truthfully, you should find out what
is in there blocking the bleed port, and repair whatever has provided the
offending material. This does not speak well for the internal condition of your
brake components btw.
And as long as you're happily removing things and such, push the pistons
back in the calipers a bit. You don't need to bottom them out or anything
like that, just move them enough to break the seals free. There's a chance
that when you then pump up the brakes, the pistons and seals will move
past their old stick point and give you a new spiffy feeling brake. This can
also promptly result in the calipers leaking fluid around the seals. Which
is then a final proof of their needing attention.
I would also not take anything for granted in this vehicle. I'd crack
lines further up just to ensure brake fluid is indeed squirting out
appropriately.
And as a last point (ok, there'll probably be others), it's quite
possible you've got that caliper open, and you're just so full of
air that nothings coming out yet. In that case, you've been
stoping with the rear brakes only. Air bubbles coming out
of the other caliper do somewhat indicate that as a possibility.
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