Kunchen is among top heroes in the game, not only for his tanking ability (looks that your purple in def is crowded already) but offensively as off color healer he is amazing. Major difference from Rigard.
If you are stubborn to not want him, that’s fine. Then go with Victor. Defense buff at very fast speed, together with your other very fast Kage for stacks, is going to be great.
Grimble and Domitia are not recommended. People say Grimble works now well against Telluria tanks - well probably these people never tried it, I tried and he still sucks. Domitia is pretty outdated, and you already have Seshat who much better fills that role better.