Thanks Cagey.
Curiosity and impatience got the better of me and I tried polishing with a Dremel yesterday, first testing on the underside of the fretboard extension.
It seemed to work nicely and I proceeded with the entire fingerboard. Overall the Dremel seemed slow enough, but not particularly effective, it really wasn't removing scratches very much.
While it looked glossier at first, it reverted to its duller look by the time I applied lemon oil to clean it up.
Looks good as it is though so I'll leave it alone.
Today I received the cosmo black covers and black poles pieces and just finished installing them.
I followed the steps here:
[youtube]https://www.youtube.com/watch?v=1eZMJl7rHg0&t=355s[/youtube]
The pickups appear to have survived the cosmetic surgery, see attachments.