I had spinnaker sheets made from 8mm
New England Ropes Endura Braid 70 feet long with the cover stripped back 23 feet. The stripped end has a luggage tag eye splice so I can either use Wichard 2373 swivel snap shackles, or take them off and loop the eye directly in the spinnaker clew grommets for light air. These work as both light and heavy air sheets. One is red, the other is green. Endura Braid has a Dynema core and a nice doublebraid polyester cover. You could probably lift your boat with it, and it is very light.
Call Henry Mallard at
Layline and he can provide some recommendations.