Priest of Wael + monk is a staple for my runs. Tanky af and support for days. Berserker and devoted would be good with it too.
Even on PotD I always dual wield, don’t need to tank what’s dead...Toutilo’s Palm is a good fit though, just make sure to take dual wield and weapon and shield passives.
IMO shapeshifter fits best with berserker. Frenzy gives your animal form +5 might, +5 con, +2 armor pen and +2 armor. It really helps make up for losing weapon and armor stats. Also, all of the barbarian passives like carnage, thick skin, bloody slaughter, bloodlust, one stands alone, etc. still work in animal form, so makes sure to get them.
I’ve done PotD with his one too, not really a main tank though.
Edit: for shift duration very little in the game outlasts cat form, if it does go wolf next. Cat is best dps but wolf isn’t too far behind. At max int you’ll get ~45 seconds duration for each form.
FWIW I’d run 10 str/10 or 8 con/max dex/max per/max int/3 res on both.