OK- following up on this with recent experince.
I am making a bunch of Jawas. a Horde, in fact. And one oft he jawas wanted to use cheap rubber boots which he provided. MOST of the wrappings did not survive long, depsite using 3m Spray77 glue applied heavily. It just sweated right off.
I just did my own boot shafts, and it was really simple, just some quality time with a sewing machine, vinyl and velcro. I am wearing my work boots around to break them in before I make the conversion on the front of it, cut the soles, and add the shafts on top.