Advice/Help needed: Swapping out hand for cosmetic reason.

[BLAUGRANA]

Hello. I am interested in purchasing a new Black Bay, but before I do I would like to make sure I'm able to swap out the seconds hand for that of another Black Bay seconds hand. My understanding is that Rolex may not do this since I only want to for cosmetic reasons, but even if they did they would keep the original seconds hand (which I want back) so as not to have parts out on the open market. So a couple of questions:

1) Would Rolex/Tudor swap out the seconds hand (I would of course pay for it) for another different seconds hand? Would they also give me back the original seconds hand?

2) Say I had the seconds hand removed from an experienced Service Center and returned to me. Then I send the watch to Rolex without a seconds hand for service where they would replace it with the hand I want. Would Rolex service a Black Bay that came in without a seconds hand?

I'm basically looking to swap a limited edition seconds hand (which I'd want to retain in the event I ever sold the watch) and get a standard Black Bay seconds hand put on instead.