I got a pair of wiggys last year and used them a couple of times. For deep river crossings, I think they're great, but could be lighter if I'm going to backpack with them. I haven't needed to yet.
I think it would be fairly easy to make up something similar to the goose feet gear waiders. Find whatever lightweight WP fabric, cut the pattern, weld the seams, and coat the foot with something durable. I'm thinking that Aquaseal could work. An alternative that would be really durable would be to coat the foot with anything layer of Aquaseal or barge cement and then mix up some of the same stuff with chipped tire and coat it with that on the bottom. I'm not sure if the actual name of the chipped tire stuff. I saw it in a video of a guy that made moccasins and coated the sole with that.