Possibly, I mis-read. You have decals on the bike. I didn't see where they had a clear coat over them. Can you take a hair dryer, heat them up, and slowly remove them with a razorblade?

If they have a clear coat over them, this won't work.

I mention a hair dryer because of the low heat. A heat gun may be first choice, but I would be afraid of overheating it. I would over heat it anyway.

Personally I wouldn't sandblast on carbon, but I don't know much about that.