I think you might be screwed on this one. Nail varnish remover is about the only thing I can think of to get it off, and that's going to leave some damage behind unless you are very carefull and very lucky.
If you can sacrifice the badge and cut it away without touching the bike, you might be able to use a cloth with a little acetone on it to clear away the glue. Lots of work, and polishing after. If it was me I wouldn't bother, but I suspect you may get some kind of twisted pleasure out of the polishing bit
Could it be, possibly, that these sticker/badges are hiding something ?
If you do get it off, be sure to say how you did it