Soft stays to mast

[CAM]

Salutations,
Long time Rigger's Apprentice owner, and lurker on this site.

My question is about a small sportboat with a carbon fiber mast. I'd like to get away from metal tangs or t-ball fittings if possible. I thought it might be possible to install a small carbon or G-10 compression tube through the mast, with some carbon cheeks around the holes, eased edges, and then pass the upper end of the stays through in opposing directions, each with a simple stopper knot (such as the double-eight from Colligo's site), with the knots living on the outside/opposite side of the mast from the stay that they stop.

Any idea what kind of percentages are achievable with such stopper knots?

Additionally, I thought it would be slick to double the line back on itself by turning the last several inches inside out, passing the self-jacketed line through the hole, and then tying the stopper knot in the end. Think there's any chance the line would un-invert itself through the knot? I guess the tail could be stitched if so?

I think I've seen similar on the Swift Solo site, but not sure if it would scale up just a little to a three person 18' boat.

Thanks,
CAM

edit: see white line here: