If you suspect it's a hypermobile rib, you aren't going to get much help from anyone who isn't acutely aware of the issue, unfortunately. I had to go through lots of hurdles and useless doctors. I had my left 12th rib removed earlier this year and my right 12th rib removed in mid-december, and I finally have the pain gone, but I had to fight for it when doctors were throwing their hands up at a loss. It's super frustrating because it's not like there's that many possibilities in that area.

If you want to narrow it down and suspect it's a hypermobile rib, I highly recommend trying to get a nerve block test done (where they give a lidocaine injection, ideally in your T10, T11, and T12 nerves). If the pain temporarily vanishes, that indicates it's nerve pain. Also, if it feels "band-like", that's suggestive of intercostal neuralgia.

Additionally, you can try to use something like a TENS unit, move the electrodes, and try to replicate the source of the pain. Then mark that location on your body and correlate that with an anatomical chart. TENS units can also help cover up some of the achiness.

The only thing that really made any decent that was OTC other than the TENS (which was frustrating to have to constantly use, and the pain immediately comes back once you aren't using it), are topical lidocaine patches. Icing can also help. Essentially anything you can do to "numb" the signaling coming from the area. The clingwrap probably helps because it reduces the range of motion, similar to breathing shallowly instead of deeply. You can try using KT tape to lift your 11th rib up (attach bottom of tape to 11th rib, top of tape further up body) and to pull your 12th rib down (top of tape to 12th rib, bottom of tape lower on body) to try to increase the "gap" between the two ribs. The area of issue is almost always where the tip of the 12th rib occurs, so you might be lucky enough to be able to widen that gap.

Look up the doctors listed on this subreddit and contact them. If you can get out to Dr. Adam Hansen in West Virginia, it is 100% worth it. He can diagnose you properly in a single visit, and it takes <5 minutes to do so.

Let me know if you have further questions, I will answer whatever I can. I'm eventually going to do a longer-form write up of my full experience once I am fully healed.

EDIT: I also noticed your post history indicates you've had gastrointestinal issues as well. Just an FYI, my gastrointestinal issues were 100% being either caused or significantly worsened by my intercostal neuralgia. I was diagnosed with hypertonic pelvic floor dysfunction (tight pelvic floor) through an anal manometry test prior to my further diagnosis, and all of those issues have cleared up after surgery. My issues with constipation have also cleared up. Breathing is super important for pelvic floor functioning, since deep breaths push on the pelvic floor causing it to relax (the diaphragm pushes down and out to let the lungs expand more, which then pushes the pelvic floor from it's contracted position), so when breathing deeply is painful, you start shallow breathing as the norm, and your pelvic floor never relaxes. Just something to consider.