I wanted to add to my proposal. I would've added it first post but 1000 char limit

I think for problems 'in-game' I feel as though compromise would be good. So if a copy was to be made, gil, tomes, and inventory could not be transferred over to the copy. Armory items, equipped items, and such would though. This way I can still keep my coil items/relic/etc but I can't break the game (or RMTs can't exploit the system by constantly creating copys. I think making the service cost something helps with this too).

The server side stuff is what would be a bigger issue I think , unless it would be viable to 'key' characters to servers, but that would make characters permanent residents of their servers. It would be trickier in this regard, hence why I think any sort of service like this would require a fee.