It'd make no sense in the narrative lol, It could already be argued that it's strange with Viera and Au'Ra ( didn't Yugiri hide to avoid being identified as Au'Ra too? ).
But Lopporits would just make zero sense.

With that said I think it'd be cool if you could unlock them through completing the expansions, I don't think it's that big of a deal really if it makes no sense.
I'd really like to play a Garlean too.
Altho you'd basically be a walking spoiler.