Re-nickel it? Apparently you are more wealthy than myself.
You like the look? Different strokes for different folks, I guess.
I think the cheapest "restorative" measure would be to have the nickel stripped off professionally. Now of course, it may not look great underneath, but I think it would be a better gun with the nickel removed. On the other hand, if it was buffed a lot, then removing the nickel would not correct that. Any buffing can't be undone.
I'm still confused on how you know its a German military C96 when you have yet to cite any evidence of that. Remember that both commercial and military guns would be marked "Mauser" and the the rest. It comes down to proof marks and or SN ranges. IMO, if you can verify its a military version, its probably worthwhile to strip it, depending on cost.
Winchester 73, the TFL user that won the west