I've modded quite a few watches but once I'd satisfied the strange urge to do it, every one of them has been sold on in short order. For me, once a watch isn't how it left the factory it isn't that watch any longer. I'd make an exception for replacement parts at a service but those are sanctioned by the manufacturer and although the watch isn't original it us still made up of parts deemed to be correct.
Swapping a desireable dial onto a Rolex not intended for that dial isn't really any different than Rolex replacing hands with a newer version but for some arbitrary reason it's not something I'd be comfortable with. Weird hobby, we make up our own rules for stuff that most people don't give a monkeys about.