BLU can work just fine in FFXIV. All it has to do is replace the role abilities with special skills learned from monsters instead of using everyone else's. It's not as complicated or out there a solution as it sounds. It can have a bigger role ability pool and the equip limit can help take care of potential balance issues.

I'd prefer something like that to using cutscenes and job quests to learn them, anyway. How boring is that? I'd rather the job not be in this game if they're only gonna go half-assed with it.