I fitted the Renold chain which went on easily enough, a lot easier than removing the old one. Fitted the sprockets, the length was right and it behaved well enough on a test run. It certainly looks more respectable than the old one. I think Renold chain would have been fitted originally so the Dragonfly should be happy with it.
Congratulations on getting your Dragonfly running, what was the problem? Good luck with the unhappy noises.