How bad is the scratch?
For most scratches, you can spray a coat or two of clear varnish over the surface; this will conceal hairline and even moderate scratches.
Here is my 1665 dial- Note the scratch above the date window:
Here is the same dial- 2 coats of matte varnish on it. Scratch is concealed- Only slightly visible out of the case.
Once installed, the scratch completely disappears under the crystal:
So, before you write that dial off, might as well give it a try. If the scratch is more of a gouge (and is exposing base metal underneath), you can try filling in the scratch with a black sharpie, and then spraying the matte- The varnish will probably even things out on the color, though if you have something you can test this on prior, that would be the best way to go...
Hope this helps.
R