I am jealous! Nepal is stunning, Was there in 2019 but with a lady so didn't punt. But Kathmandu is a large city with lots of poorer (but happy people) so would be surprised if there wasn't punting opportunities. BTW, people talk about traffic being mad in Bangkok, well Kathmandu is madder!! Also went to Pokhara but from memory, that is quite a small city (in fact more a town size) so i would think less opportunities there.
However, Nepal is a place where lots of younger and middle aged people go trekking - people who are generally more active and adventurous. Met lots of people travelling solo including ladies. I think if i wasn't already with someone i could have pulled civvies - and i am only an average guy who then was mid 50's.
But that was all 4 years ago so maybe changed a bit?