Hiya
I was told that my neuropathy wasn't diabetes related, because I didn't have diabetes, despite having about a dozen diabetes symptoms. I actually think if you have the symptoms, you probably have the disease. In any case there's nothing magical about the 48 level for automatic diagnosis - it was chosen because retinopathy is rare at BG levels beneath 48. Rare, but not unknown.
I had neuropathy from around 2014 when my BG was somewhere about 43 or 44. It took three forms - stabbing pains, pins and needles, and burning feet. It went very quickly when I got to an HbA1c of 36. I had it and then suddenly I didn't have it.
However I still have a residual tingle, which is not the same as any of the symptoms I had on high (high for me) BGs - and after four years I think that's probably permanent damage. It's not pain and it doesn't cause any problems. I do see what you mean about the dental anaesthetic - it is fairly similar to that.