I bought a replica fibreglass sidecover a while back.
Whoever had done the moulding for it had copied it off an original sidecover - and hadn't peeled off the decals (vinyl) before taking the mould. !!
I just sanded off, in the fibreglass, the raised lettering, and painted it.
If you were careful, you may be able to paint the lettering.
Or find a decal (vinyl) set the exact size, and stick over it.