You already have some? I wasn't going to suggest above because it's like buying 2 sets of cranks, I think you can get after market rings though.
I have one on another bike, but since this is all for just one trip, I could swap it, convert it and then redo the whole thing afterwards.
Who makes them? If it's the same as the 1x it will come out more expensive than a whole new crankset and as you say, 165mm isn't bad
@snottyotter started
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You already have some? I wasn't going to suggest above because it's like buying 2 sets of cranks, I think you can get after market rings though.