Accessory navicular diagnostic and cast questions?

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So, I'm 26. About a year and a half ago I started to have progressively worse pain and issues in my right foot, after playing Dance Central for a few months (don't judge, it's fun ), which involved a lot of jumping and bouncing and so forth. Pain, tenderness, arch tightness and discomfort, swelling along the side and bottom of foot and under my ankle, etc. etc. My feet have always been flat and the right foot has always been somewhat troublesome. The pain got worse. Off to the doctor I went for an X-ray. I live in a little backwater hick town, so unsurprisingly the radiologist at the medical center (we don't have a hospital) didn't see anything. The orthopedist suggested it was a deep tissue sprain and to wear a CAM boot for two months, and it would be just fine. Needless to say, it was not just fine. Flash forward to a year later, and I still couldn't do anything other than an ambling walk for more than a half an hour without increasing pain, and the swelling persists after the walker, 3 months of physical therapy, ice, nsaids, custom orthotics, etc etc. Finally got in to see a sports medicine foot guy. He ordered an MRI, to be read by a sports medicine radiologist specializing in extremity injuries and abnormalities. He noted an accessory navicular as the likely cause of the pain, which he spotted on the MRI (we were looking for tendon issues; I'm aware that MRIs aren't really for imaging bones). Now, I'm not overly surprised that the original medical center radiologist missed this, but I am inclined to think it must have been pretty small because of it. (Doctor called yesterday to give me news, I will be seeing him in about a week to discuss the next steps and for him to show me where exactly it is etc etc). Not being an orthopedic surgeon, he has been pushing prolotherapy pretty hard (even though there is no evidence of muscle or tendon issues, other than post tibial tendonopathy), and is trying to convince me that it only "might" be this causing the problems. I feel like it fits all of the symptoms that I have experienced, explains why I SEVERELY screwed that foot up at age 11 with a simple ankle roll, and overall, frankly it's gone on for long enough that I need to get it taken care of, but that is a whole other kettle of fish. We have an orthopedist appointment in about a month that we will probably try to expedite now that there is something to talk about. If we decide surgery is appropriate, there are a couple rubs. One, I'm allergic to morphine and all of the "caine" drugs and cannot be consciously sedated due to severe asthma and risk of lung depression, so I will have to be fully anesthetized and monitored for the procedure if it's done, and my understanding is that this is not common with foot surgeries. I'm not too worried about that, as it's also not common with bone marrow biopsies or endoscopies, which I had to have it done for both. What worries me more is that along with all of my other unbelievably obnoxious health problems, I have autoimmune issues that cause my skin to react severely to everything as if it's an "allergy", especially heat and moisture, both of which happen under a cast. I take 2 different prescription antihistamines, an h2 antagonist, and moderate dose prednisone daily because of it, so yes, it's "that bad". This means that a hard cast is out, because the likelihood that I will develop serious complications or a MRSA or fungal infection under the case is extremely high. My PCP and allergist will both vouch for this to the doctor, if he doesn't believe me (and I know, it sounds a bit far fetched). I've noticed from glancing through that most people seemed to be in a hard cast for at least a few weeks, though the official guidelines for the procedure call for splinting or casting. Has anyone had a splint (fiberglass removable, CAM type walker, air cast, etc) alone, and if so how did that go? Obviously I'm not an idiot and wouldn't try to weight bear at all on it just because it wasn't in a hard cast, but I'm afraid that I won't be considered a good candidate for the surgery if I can't have the hard cast. After trying every single recommended non-surgical therapy and being in pain constantly, I'm really just to the point that I'm willing to have the surgery and deal with the (possibly quite long) recovery period, if it means getting my foot back, because I am unwilling to live like this for the rest of my life at 26. It goes without saying that I will be talking to both doctors about it, but if anyone has any thoughts on the cast situation, they would be greatly appreciated (or if anyone else didn't have one that was so glaringly obvious on an X-ray that it couldn't be missed).