Jon, I decided to forego the epoxy route since this bridge was just too
far gone and, as you said, it would be hard to tell where the pins were
really supposed to end up.  I finally was able to get the bridge off
the soundboard by persevering with hot water and vinegar (as suggested
by Bill Maxim, I think), 'grooving' the area at the top of the joint to
concentrate the solution better and (here's the brute force part)
grabbing the thing with channellocks and rocking it.  A few splinters
did come out of the soundboard but not too bad.  It really isn't all
that expensive (around $125) to have this particular bridge duplicated
by Schaff, so I think I'll take the easier route.  I do dabble in a bit
of woodworking but drilling all those pin holes at the correct angle
and location sounds a bit beyond my patience level.  Thanks everyone
for their advice.