According to their server transfer "rules", since Rizlona is a less restrictive ruleset (no truebox) vs Aradune (truebox and 2 box limit) they only direction that transfers will ever happen is Ara->Riz, never the other way.
Nope for the reason Tweakfour17 listed. Well I mean never, may be a tad strong who knows what will happen once they reach live, but not in the near future.