That would probably work. The Overview builds are just suggestions, and not tested (as written in the original post). I try to keep up with all of the information filtering into the Cleric Forum as I see it, but I sometimes can’t catch everything.
However that build you mentioned is the same as the super popular PD build on the Cleric Forum. So I believe it would work with Kabbalist.
You’ll start noticing even in the daily lv. 100 Missions that Wizards, Archers, & some Swordsman Classes will have very little SP after their rotation of abilities. And if you haven’t taken note yet, almost every ability in this game requires SP consumption in some way. So having a Kabbalist is extremely valuable as @_Nekorin mentioned.
Merkabah will benefit from the INT directly. I don’t know how draining Sadhu is in SP, so Ein Sof for SP is kinda up in the air. RS I assume will stick onto your Body while you are OoB to help protect you. Math is currently in a bad state, might get better later.
So there are definite benefits, but I don’t know enough about Sadhu.
Merkabah is the only skill that scales with INT as it is the only MATK ability in the entire kit. Ein Sof scales with the target’s Maximum HP. RS scales with the damage you would have taken from a hit. Math skills do not scale with any stat.
To give you a short answer, INT. But Merakabah is the ONLY skill that benefits. Otherwise it really depends on what classes you picked before hand.