I see, hmmmm. I've not faced this type of problem, but if you used solutions, especially the stronger stuff like MicroSol, I think it actually sort-of melts the decal into place; at least substanially softens it. Pulling-up might not even be an issue.
If they do pull up, you're likely to get the model back for repairs in a few years!
Anyway, lots of luck with it.