As you may have noticed, fantasia is the most controversial topic out of the ones you raised. Some (such as myself) generally frown on its use IC but there are others who are completely neutral to it.
I think the best thing to do is just petition your own RP community and the people you are planning to RP around and see what their feelings are on the matter.
I'll also echo those who said that using "glamour" to explain why your Au Ra was appearing as a different race is perfectly legitimate. In fact, so many people are doing that that it's almost turning into a player-made lore thing that Au Ra use glamour to conceal their identities.
I think the best thing to do is just petition your own RP community and the people you are planning to RP around and see what their feelings are on the matter.
I'll also echo those who said that using "glamour" to explain why your Au Ra was appearing as a different race is perfectly legitimate. In fact, so many people are doing that that it's almost turning into a player-made lore thing that Au Ra use glamour to conceal their identities.