It’s really the bearings but I don’t know if there is a way to fix this.i.d. really like to keep these because I actually like the rust I like the look of it and if I replace this one I also have to replace the backI'm curious where your rim broke, got a picture?
A bike coop would be a good place to look for new wheels. Sometimes you can find a whole bike with good wheels at Goodwill and dirt cheap prices.
Cool tread on the new tires.