just add garleans as a subrace for hyur and elezen. just throw a line in somewhere that hydaelyn gave you the ability to use aether normally because of the whole paradox from elpis (we receive the blessing from hydaelyn -> we go to elpis and meet hydaelyn -> she gives you the blessing because you would have become tempered to ifrit and killed and therefore unable to have met hydaelyn in the first place)

have the blessing include that. or just have us be extra special and allow it due to us being a shard of azem