Doing a re-set on a '65 D-28 and suspected it'd been done before ... and then knew for sure once taking the neck joint apart.
Someone had managed to crack off the top (or bottom, I guess) cap of the neck tenon and decided. "meh... who needs it?" before reassembling things. Kids these days.
Anyway, if was a good time to fashion and install a mahogany replacement and ... after much gnashing of teeth... decided to commit the unpardonable sin of attaching it with (gasp!) epoxy.
My reasoning, however, was this: if I'd used HHG or TiteBond, the fix would've come apart at the next steam-off, so epoxy became a reasonable decision. I figure three Hail Marys and I'm good to go.
Yes, even epoxy has a place when doing restorations. Mostly for non glued damages like this one, or when modern glue is used in new guitars. I regularly use epoxy to glue the bridge on plywood tops, there is a ton of modern glue in the top anyway. As hard as epoxy can be to get loose, it's actually not an unsolvable project with a bridge with a glue seam that you can attack from all sides with sharp spatulas.
That's one way to do it. But it actually shows that a bridge is always possible to be successfully removed, no matter what glue is used :-)
Epoxy will release with heat.