What was the issue with clipping the wings? I got my muscovies as adults and even though they weren't used to people, I just walked each into a corner, extended the wing (a few of them I had to put my leg against to hold still), took some good kitchen scissors and cut the first ten longest flight feathers on one side. My male huffed and puffed and my females trilled but didn't retaliate. I wouldn't dream of attempting this with chickens, they just explode in all directions.
They're only good weeders if they have nothing else to eat and are confined to that area. They get lazy if I give them feed in the mornings so I only give them half a cup each before I coop them up at night.
Good egg layers definitely. I have two that lay every day and one that lays every so often (still young).