Usually when I 'suggest' something I have actually tried it, but not with this. I have used dyneema
as shore lines but not as anchor rode. And we don't need/use a snubber with the shore lines.
It has always sounded like an interesting idea, worth trying, but, really, "I don't know, and hope to learn from you, as you figure it out" is unfortunately my answer here.
I would try the various gripper hitches first. If they grip, then they will be an easy and good solution. If they do not grip the bare dyneema, then putting say 2' of dacron cover where you might want to grip most probably would work
(and would be nicer than splicing in metal hardware).
My load cell is coming first week in January, and I have testing these gripper hitches (including on bare and covered dyneema) on the agenda. So I may know more, be more helpful, next month. (I have a nice aluminum
I beam test bench constructed, just waiting for the load cell and 10 ton puller cylinder to arrive)
As to winching . . . we have/do do that . . . and if you put a bunch of wraps (say 6) around the drum it will come in without slipping. I do not think it would work with the rope/chain combined gypsy's.