I had *exactly* the same problem (head busted off seized-up
screw/bolt on rear outter cv joint.  There was a tad sticking out
so I used a small torch to heat up the busted stud and tried the
visegrips.  No go.  Then the drill.  Before the drill part was finished
the stud start wriggling all by itself, I think due to the surrounding
metal heating and the hole in which the stud was stuck slightly
expanding.  Came out with fingers.  Yikes!  It was hot!  I wonder if
I made anything *too* hot and did damage?  But that was 25k ago
and it hasn't manifested.

I think if you remove the cv from the tranny and remove the
inner race on the tranny side, and then remove the wheel (and brake?)
you can pull the axle out attached to the wheel and put the whole
thing on the work bench.

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Steve E