Aloha JeepNerd,
I believe by now you understand that most here are advocating for your wife to seriously consider having surgery--and not just "sit and wait."

As one who was misdiagnosed for months, even while I continued to experience TIA's, I ended up having an emergency double bypass and EDAS from a MM specialist that is located right around the corner from where you're located! ;

If I did not have this surgery, for me, I am sure my TIA's would've turned worse--possibly into a major stroke, if not worse.

Although surgery is the only option I feel a MM patient has to ensure our brains receive the necessary amount of blood, your wife's medical team must have their personal medical opinions why she shouldn't have her surgery just yet. (i.e. You mentioned 'location') I am not a medical professional, so I am not able to comment on her specific situation.
Nonetheless, I would encourge you and your wife to seek 2nd and 3rd opinions just as Kim mentioned above. If I didn't....who knows where I would be right now.

As you know, all you have to do is send your wife's most recent films to MM specialists for their opinion. It doesn't cost you anything (except for postage)

I know of 2 other MM individuals have decided to participate in a MM study as well (not sure if it's the same one you're referring to); however, I opted not to participate.
Outside of the study, one of these individuals was advised that her other side (she had surgery on one side already) was progressing, and although she didn't have symptoms, she decided to go ahead with the surgery. Now, she is experiencing twitching and frequent numbness post-surgery. Should she have waited and not been so anxious to get her 2nd surgery over with? Who knows... At this point it's water under the bridge...and we just have to see what the dr.'s recommend at this point.
Bottom line: I would wish that you and your wife seek additional opinions from MM experts in the field and then go from there... And yes, I am "J" of you being where you are..

We're all here to support you and your wife!

Take care,
Shan