I was in a similar position prior to FIRE. I had been enrolled in health care plans with an HSA for 5-10 years before FIRE. However, in my last year I had shoulder surgery (torn labrum) and quit my job a couple of months after my surgery. For me, everything worked perfectly. My new plan had the highest premiums of the options offered by my company, but the surgery ended up costing something me a few hundred dollars out of pocket plus a few hundred in extra premiums from January - April.
I don't really have any thoughts on something else to consider other than things I'm sure you've already thought about. Make sure the surgeon and everyone else (anesthesiologist, PT, etc.) are all in the new network. You'll probably want to get authorization as soon as possible after you're on the new plan to be certain that it'll be covered. What will you do for health insurance post-FIRE? Do you know how much COBRA will cost or will you move to an ACA plan? If you hit your OOP limit and deductible then staying on with COBRA through the end of the year might make more sense, depending on the cost.
I don't know what your surgery is going to be like, but for me the worst parts of recovery were sleeping and being so limited in what I could do for the month or so post-op. I don't have a recliner, but I think that would have been worth almost any price during the no-sleep 3-4 weeks after surgery. Seriously, if I have to have shoulder surgery again I'd buy a recliner just for those few weeks. I ended up buying a foam wedge to try to help with that problem but it only helped a little bit.