Any solution for that bit of fretboard seemed like a lot of excess work for little gain, since I'm not confident I'd get a result that looks any better than it does now.

I'd be fine with a nitro finish if it gave me the look I'm going for. I just don't have room to spray at home so it's harder to do. That site doesn't appear to ship to the US right now, and I'd probably rather get something domestic anyway because I the international shipping would probably cost as much as the products.

Colortone is an option. A can of the guitar lacquer to use with my brother's spray gun and some white pigment to mix. Will have to look into other options.