After hanging one of my homemade bark savers (and my climbing line) this morning on a not very tight crotch I think I need a redesign. My current device is a length of 11mm rope with a double noose knot (aka fishermans knot) on each end. I'm using 'biners instead of rings. Installs fine, works great but one of the slip knots hung the tail end of the saver on a small but very tenacious bit of bark in the crotch when I was taking it down. Removable by rethrowing a line and pulling the rope back through the crotch in the other direction but a pain in the butt.
I'm thinking that I could make a continuous loop similar to a footloop out of 11mm rope, using the double fishermans knot as shown in Jepson's to close the loop. Then tape the knots to make them more smooth for going through the crotch, and make them more secure. For ring attachment either tape or whip wrap the ends to create a tight loop for the biners (or rings).
So bearing in mind that I don't want to spend money right now on a ready-made false crotch and I have no splicing skill at the moment

... Any ideas on how to make a bark saver with rope without splicing? Does the design I proposed have any obvious flaws?
Thanks!
-moss