Not a folk song as such, but I have been trying to learn "Pirate Jenny" from the Threepenny Opera for ages. It's a brilliant song, but, like "Wife of the Soldier" a bit tricky to accompany. I think it would be just the job!! Hwyl, Bron.
Oh, if you do "Sally free and Easy". Try starting a capella, and get the instruments to come in one by one, verse by verse, till everyone's in by the last verse, then all come to a dead stop after "Hope she dies of shame" Well, that's how we do it. Bron.