Tim, that looks as if it would work. Do you know if he ever tried it? Just holding a tape to the 20 ga. tube, it looks like 7/8". Not sure, haven't put the caliper on it. If so the 3/4" would be too small and the 1" too large, but I'm sure the correct size could be found easily.
I didn't realize the Pardners were made in China when I bought it, or more than likely I wouldn't have. Since it seems they can't import barrels at this time, you'd think Remington would simply move the band and make some Pardner barrels.
Pete