...well... I don't know how you can take your sub off. Mine is welded to my person, never to be removed; if fact I think it would require an SF team, some quick acting sedatives and a surgeon!
Seriously though, I've considered a watch winder many times but never been too successful with rotation so most autos normally live in the box or safe, and to my mind they're gone to so infrequently, a hand wind and set is no chore at all.
In short: not needed in my scenario.