Working with the single filaments in the fabric and clamping with those screw terminals was quite difficult:

• arranging four filaments in one sleeve is simply hard to do
• using less than four filaments per sleeve would require more sleeves, and more clamping. There's simply not enough space for that if the filaments have the same thickness as before
• it's hard to fasten the terminals without moving them

So I'll also try to use plain (non-woven) rovings and ribbon tape and see if they are easier to handle. A simple tool for easier arrangement in the sleeve is probably also a good idea.