To lume, or not to lume: that is the question.

[Rolex_Rookie]

I feel like a giddy school boy after scoring this 16750 at a local auction today. It's in dire need of a service and I'd like to get the group's thoughts on whether or not to replace the GMT hand as it's missing the lume plot.

What instructions, if any, should I provide when getting the service to ensure I'm not negatively impacting the value? (polish, lume, etc.)

I assume it's possible to replace just the GMT hand, but maybe I'm wrong. My main concerns are: 1) color matching the other hands; and 2) any negative impact on the value of the piece.

Thanks in advance for any guidance!

P.S.
Sorry for the sideways pics, rotating before uploading didn't fix