Haven't come across armed monks outside of Japanese Sohei. [edit: and now seeing the Perry ones below]
Foundry has some nice active monks, including one with a club that I've used for Silver Bayonet, and one wielding a good head-bonking cross that will likely get used at some point.
If you could shift to armed nuns, 1st Corps' Hussite women with polearms are perfect as is. I used those for my SB cultists. Just posted pictures of them last week.