Asking for a bunny tail on a Viera is like asking for cat ears on a Hyur. They do not have these. They never had these. Their bodies were created without these features since their incarnation.

Now if by some zany chance one day we get "Tail armor" slots, then you're more than welcome to petition bunny tails to be added as an armor/cosmetic piece. But until then, no. Viera do not have tails and never did.