-sail tape will work well (99%) if you activate the adhesive by HEATING
it after you stick it on. Doesn't take much heat. If you use the white sail tape/insignia cloth, you can tell when the adhesive is activated -the tape becomes translucent and the color of the fabric below shows through more.
At home I put the canopy on a flat surface, clean and align it, apply tape, place a towel under it, then apply heat. I use a clothes iron that has been turned on to lowest setting, then unplugged for a minute! The adhesive only needs ~40-45c (100-100f) or so to work, so no need to crank it up and melt the kite! In hot weather if you leave the repair tape in the car it will be hot enough to stick well on its own, if you apply some pressure and rub it.
For a quick repair, not heating it gives you some sessions usually, you can still use heat to set the adhesive later. Mellting the adhesive allows it to penetrate the weave of the cloth more, increasing surface area for it to stick.
On a reinforced part of the kite, use some "aquaseal" or other PU that cures flexible to glue the canopy or tube, then throw patches on (both sides, one patch bigger than the other). For long or jagged tears, use cyanoacrylate (superglue) to align and glue (spot-weld) the fabric together before applying repair tape.
insignia cloth is plenty strong for canopy, it's what they use to reinforce a lot of canopies. It could creep I guess, unless it is sewed. I would sew it if you want to be able to sell it. I tend to run mine into the ground instead -literally, unfortunately
-that's why I am experienced in repair.
But for the LE, I would rather get it done right... As to thread size, v92 is actually heavy anyway , just do your best to match what is there.