Also sorry for your loss. I agree wholeheartedly with
@Togri v. 2.0 – I wouldn't change a thing. Not out of respect for or in memory of your dad, but because I think it looks better than new service parts would look. As for the functionality, do what sensible humans do and use a phone to tell time in the dark.
Having said that, if you really don't enjoy the patina, and prefer the look of a new watch instead – then by all means make the replacements. It's meant to be enjoyed, and I am sure that is what your dad would want. Just make sure to keep the replaced parts ...and then just get on with enjoying it.
P.S. Helluva wheel shot there to start off with.
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