[Sean Williams]

I think the problem here is one of right tools for the job.

Automotive paintwork specialists are more set up for large area painting and machine flatting between coats.

The high gloss looks to be the result of a 2K paint system, which will almost certainly be an isocyanate based lacquer - this will have cured to be as hard as nails now! if the surface is truly flat your best bet for a cheaper way out of the problem would be to get new decals on a contrasting background to reapply, but this seems to be a great pity.

How about getting the front of the chassis engraved, and then getting a motorcycle painter to infill the engraving, and do a spot lacquer repair to the front panel?