Took a while to get motivated and stitch the thing back up but I just finished it... I used one of the inner strands from a piece of paracord. It works in a pinch but I don't recommend it, it tends to twist and fight as you pull it through.

Just need 2 3/4" d-rings and 2 conway buckles (I ordered 1" by mistake...)
Gigag04, I missed your post last year! I appreciate the offer, if you have any leather dye equipment I'll take you up on your offer belatedly. I'm going to order some as soon as I can find some 3/4" hardware.