Its time to remove job-based glamour restrictions.

[Iscah]

Given how they've setup other systems in this game, I have a strong feeling that we're not actually "glamouring" an item per say, but ACTUALLY equipping it in a 'ghost' slot the game is using, which would make it impossible for any other job to glamour anything they can't actually equip. and the reason they use "job identity" as the PR response since it would take more time than they want to allocate to change.

Glamours are linked to the item rather than you or your current gearset, though. Unless it's reading the "glamour instruction" on the item and placing it in the phantom slot every time you change gear, I don't think that sounds like the way it would work.