This would really help me too. I just don't ever bother playing anywhere else because keeping hotbars and gear sets up to date is too annoying, and I'm sure not paying for expansions for any other platform. We don't need real time syncing, just a server sync option on the login screen and we're good. I would even pay extra for this feature, especially as I've lost and had to recreate all of my sets for PS4 once in the past when my character file corrupted (don't ever log out right after switching jobs, it's the worst feeling in the world the next time you try to log in).

Ironically I can't even backup using PS+ as my PS+ is on the wrong PSN account because of SE's bizarre insistence that each account be locked to a specific PSN ID for a specific region, despite this not helping at all when my account gets locked out every time my dynamic IP updates. My sanity would greatly appreciate cross-platform server syncing of all character settings.