I know that with shadowkeeper, you can assign one kit to a multiclass, for example, Kensai / Thief or Fighter / Assasin, but not both. I suspect that a character can only have one kit, no matter what (I might be wrong).
Kensai / Mage Rocks. So Does Swashbuckler / Mage.
Sorcerors and Monk are classes, not kits, and it isn't possible to create a new kind of multiclass in shadowkeeper. I've seen people create custom classes, and I imagine a sorceror/monk type char would be possible that way.
You could probably create a class with the abilities of double-kitted class, but it would have to be a new class.
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