I’m a dumb ass

Converted to warlock expansion with all my characters, but I left 7.5m gold in the bank.

Gold is easy to find and make, I get it, but I’m also just about to hit 93 and start gambling a ton on rings/amulets to craft some items

Is there any easy way to move this 7.5m over to expansion without starting a new toon, leveling (to avoid having to move 10k at a time?) and then maxing personal stash, rinsing and repeating?