--as long as it won't be at any major financial cost to you.

The thing is, many of us (you fall into this category, I'm sure) are "complicated cases" that may have multiple ongoing issues.

Especially with neuro symptoms, those from damage to the peripheral system can be exactly mimicked by those from damage to the central system.

And--there are conditions that damage both systems--many nutrient deficiencies (especially B12), toxic exposures, viral assaults, and vasculitic autoimmune disorders (this may be what they're looking for, given your back and forth with the possibility of amyloid over the years--amyloid "plaquing" could show up on brain MRI with contrast, and not just the kinds associated with Parkinson's or Alzheimer's. . .).

They may also be looking for any evidence of ischemic disorders of the brain (strokes/TIA's).