So I've fucked up a bit by buying some gem codes from CDkeys. I didn't realise they can't be used with the Steam version.
If anyone on the non-Steam version of the game wants some gem codes, shoot me a pm or something. I've got 2x2k, don't mind selling them on the cheap. Better than getting nothing for them.
EDIT: I was able to get my old account unlocked, pretty quickly too, and used the gems there. Will just buy what I want and gift it over now.
Might give it some time though, I'm a little wary about getting banned. Unlocking an account, adding gems, and gifting stuff to another account will look pretty sus.