Yeah, I've been working with managing what is essentially a database system for a while (28 years, since 1985), and I've seen more database corruption than I ever wanted to see. And a good part of that time was spent on interfacing and data movement. It is never ever easy process. As IT person, you should know that. Heck, my current project involves updating what is essentially 2 tables - ICD-10 codes if anyone cares to know. It's been going on for almost two years of active full time development by several people. It is behind schedule, and that is after US Congress allowed to extend deadline by one year, because our system is not the only one behind schedule. So, yes, I am fully aware of the work involved.
And user-level tools are never easy to write.
Not done yet?
Less game, more work and you'll finish it. :p
Jokes aside, without trying to take care of customers and having DB admin capable to alter DB this game does not have bright future...
Even if RW did not provide tools (which I find unlikely), it is possible to make a changes, move users from server to server and/or move stuff between servers and users... (move mounts, pets or what's not)
Still easier just to say it can't be done...