Considered using clerics? A quick internet search revealed that the monks were priest kits in 2e. If you prefer unarmed strikes, the unarmed fighting style from Tasha's is to be had with a feat.
Otherwise, way of shadow seems to fit the assassin / infiltrator role nicely. The challenge here is how to incorporate their apparent capabilities in the Charisma skills like deception and persuasion. I don't know of any homebrew, but you can start with a way of shadow, then add something like Otherworldly Glamour from the ranger Fey Wanderer subclass (add Wis modifier to Charisma checks, get proficiency in one Charisma skill).
Monks were priest kits in 2E as you mentioned, but a more 1E version of the class is included in the appendix of the 2E Scarlet Brotherhood paperback supplement. I can't remember offhand if it used the martial arts rules from the fighter's splat book or Oriental Adventures.
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