Not sure Bastion would suit him for the same reason Alexandros Morgraine wasn’t sent there. Yes they are dedicated and noble leaders, but there’s something much more raw and primal driving them.
Also can you imagine being a Kyrian, meeting Varian, and having to tell him “So you know you’re going to have to forget eeeeeverything from your past lilfe”? He’s probably just going to punch them square in the face. The man already had spell fuelled amnesia when he got split in two, he probably won’t want this to ever happen to him. He also has a Wild God connection from his gladiatorial half, so at this stage, both Maldraxxus and Ardenweald can fit him.
Now if anyone might be still found in Bastion, it could be Tyrion, he fits perfectly there just like Uther.