Maybe get a small, inexpensive 'biner (Nite Ize), clip that on a belt loop, and loop an appropriate length of paracord or whatever rope/twine tickles your fancy. Attach that to a knife you already have that you can open/close easily and comfortably one-handed. The vast majority of pants I own require the second hand to essentially hold the pocket to sufficiently secure the clip over the seam.
Apologies if my suggestion is short of succint; I've had one of those rare and thirsty evenings.
Just a thought, good luck with the recovery!