Kabbalist is more of a “filler” as in it doesn’t have any particular synergy with other classes. So you want to work on the Inquisitor side.
Inquisitor being physical melee, it obviously works well with the other physical classes: Paladin and Monk.
Cleric 2 > X > Paladin 3 > Kabba > Inquisitor (X being usually Cleric 3, Priest 1 or Dievdirbys 1).
Not sure exactly about a Monk build, since Monk arrives at rank 5 (so its circle 3 is rank 7) and I’ve never built one.
Chaplain-Inquisitor is also pretty popular, but since it’s mostly about auto-attacks and support, you might not like it ? Although you can take into account that Inquisitor’s wheel will spread your damages, and in the next months Sacrament and Last Rites will be buffed quite a lot and since you’ll spread your big AAs it might be a pretty effective and interesting build.
Dievdirbys 3-Inquisitor is also popular - mostly for PvP - since you get Ausrine. But it is more static/defensive and not aggressive.
Personally I love Palinquisitor, especially since they’ll add soon™ extra offensive and defensive skills to it, but Paladin doesn’t have amazing base damages.
For a good hybrid, you’d need to heavily invest in your weapon. And I feel that the best magical classes to mix with Inquisitor sadly arrive at later ranks, so you can’t have Kabba, Inquisitor, and these classes together.
Not sure with which classes I’d mix it at the moment. Sadhu-Kabba-Inquisitor seems pretty awkward, for example.