Asdf,
There are a couple of ways to answer your questions depending on the goal of the Dux shrouds. If it is just an emergency/get home set up then I would double the strength of the largest wire on the boat, eye splice it onto a thimble with a turnbuckle and call it done. Quick, dirty, but it will work, and work well. If you are thinking of switching to fiber rigging then you need to do more work, and probably just call John Franta at Colligio to design the system for you.
As for type, Dux is a name brand and is exacally the right line to use. There is another option (but I can't remember the name). It is the same heat treated dyneema as Dux but from a different manufacturer.
I don't like the eye splice onto a thimble as a permanent solution since the entire load has to be carried by the very small contact interface between the thimble and the clevis pin. I actually have this on my trimaran, and it works, but I would much prefer a terminator. The larger bearing surface is a better option.
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