I would argue my setup would be doable with a wall RW and Protectga without being SIGNIFICANTLY easier, but I've been known to go overkill on min-maxing the game.
My run where I brought Y'shtola and Yuna for Wall and AOE heal with a Lunatic High RW, Yuna ended up being completely useless out of her underpowered Valefor summons in P1, because AOE heal would have messed up my strat. She did literally zero damage to Vossler past 50% (might as well defend to reduce incoming damage rather than autoattack) Replacing her with a DPS would pretty much have come rather close on overall DPS as having party haste. Keeping up on healing on the CT0 tank was a non-issue as Vossler was hitting for under 290 per hit on Cecil - it'd take 3 full turns for Cecil to go under anyone else's %HP from full, and a Curaja easily covers that much. Mechanically, outside of requiring a heal to top up Cecil, it's similar to the Unyielding Fist strat, except the wall RW helps mitigate the AOE damage.
edit: worth reposting
This is what it should look like. Plus the third hit in a triple CT0 two turns after the last heal.
My run where I brought Y'shtola and Yuna for Wall and AOE heal with a Lunatic High RW, Yuna ended up being completely useless out of her underpowered Valefor summons in P1, because AOE heal would have messed up my strat. She did literally zero damage to Vossler past 50% (might as well defend to reduce incoming damage rather than autoattack) Replacing her with a DPS would pretty much have come rather close on overall DPS as having party haste. Keeping up on healing on the CT0 tank was a non-issue as Vossler was hitting for under 290 per hit on Cecil - it'd take 3 full turns for Cecil to go under anyone else's %HP from full, and a Curaja easily covers that much. Mechanically, outside of requiring a heal to top up Cecil, it's similar to the Unyielding Fist strat, except the wall RW helps mitigate the AOE damage.
edit: worth reposting
This is what it should look like. Plus the third hit in a triple CT0 two turns after the last heal.