It should work fine for gear-granted auras like Chilling Presence for example, but what happens if you try with say Night’s Chill? Can you make it level up?
Actually getting passives to work in this manner is a little tough. I haven’t figured out how to do that short of Celestial Power procs that are assigned to single skills. Insofar as I can tell, you can only grant global Active Skills, rather than global Passive skills.
But you can of course grant an active Aura skill.
To my knowledge, no. But I’m still investigating that. There’s a ‘skill level’ equation for each node in Devotion, but it doesn’t seem to have any effect unless I’m just implementing it totally wrong.