The large gaps will also cause the controls to be less effective than they would otherwise be. You can compensate for that with larger throws of course.

If it's CA hinges, if the gap is large enough it can cause up-down movement on the hingeline, which can lead to flutter or can cause the surfaces to not center accurately enough, making the plane hard to trim out.

I'm not saying it will be a problem, I just don't know either way. To be sure, just cut the hinges and put in new ones next to the old locations. Easier than trying to use debonder.

Or you could just fly it, taking it easy and being careful. You should be able to see if it's going to be a problem with out risking a crash if you are careful with it. I've seen planes with rather large gaps fly just fine.