Of these three I'd look into the Polish DPM kit as a better choice even with the trashed barrel. A qualified gunsmith can install a sub-barrel inside the perforated DPM barrel perhaps made from a Russian 7.62x54R rifle or a rechambered .303 barrel.
Look for an early import kit that isn't totally trashed to garbage. Perhaps some savy shopper can scare-up the RP-46 belt-feed conversion module in Europe at a useful price. Those things are cool.