I agree that it's best to follow the manufacturer's directions when breaking in an engine. I always break mine in on a stand. The extra rich settings during break in can really really make a mess of your plane unless you put a muffler extension on to get the slime away. Also I find it beneficial to not shaking the airframe to pieces when breaking in. The Saitos I've broken in have run very rough before starting to break in. 2-strokes seem to run pretty smoothly from the beginning.

For the epoxy, I'd say use a dremel tool with a cut-off wheel or small cutting bit to cut the wings apart if you can without damaging them, then use a grinding attachment to remove the hardened epoxy. Then re-join them with 30 minute stuff to give yourself more time to get the halves lined up and joined properly. Epoxy usually starts to set sooner than what the label says. Mixing in too much hardener can speed up the process.