yep i have no wrinkles I did the test, i get stinging feet if i've been standing up too long, it goes away if i lie down, no tingling or burning sensations elsewhere - i have hair loss on legs but its from top down not bottom up, i test negative for diabetes. so lots of "half" symptomsif you have zero finger wrinkles after 20 min in hot water, it's a symptom.
Another easy symptom you can see is lack of hairs on legs
Leg hair loss (leg alopecia), a sign of neuropathy in Diabetes, 2019 | Phoenix Rising ME/CFS Forums
But if you wish to be tested for SFN, it may be better to talk about tingling in hands and feet or burning sensations.