The swivel is not what prevents halyard wrap, it is what causes it. You need to install a little halyard restrainer above the swivel and just below the jib halyard block at the hound to stop the halyard from being wrapped with the swivel. That is what I had to do.I still can't picture how a swivel would keep the halyard from wrapping around the forestay when furled.
This pvc furler is what came factory on my 1974 Chrysler Mutineer 15'. I like it. Simple and works well. Will have to try it on my 26s.