For anyone who is interested, I have more information on sights and P5 gunsmithing. Tooltech (248-628-1811) does indeed install three-dot tritium sights, with white outlines, on the P5, for $205. A small price to pay for their effectiveness in a nighttime defensive situation in my opinion.
And I received a detailed reply from Earl at Earl's, reprinted below:
Dear Sir,
We do not polish the feed ramp of the P5 as this is Hard Coat Anodized and you should not remove this coating. We can smooth / remove the serrations and reblue the trigger = $40, we can do a trigger job = $85, we can install night sights = $285 and we can "tune" your gun up to be extremely reliable = $95. We can debur all sharp edges of the upper unit and reblue both the barrel and slide = $195. We do not strip and re-hard coat the frame. This will take 3-4 weeks.
Sincerely, Earl
I don't know why his night sights are more expensive. He might just send the slide to Tooltech, or he might have his own system (perhaps retaining the windage adjustment of the stock sights?). But the quote for the rest of the work is reasonable, and I know his quality is above reproach.