Have you actually done any before and after blood glucose levels with these potatoes? Would you mind posting your results please? I did and found that my blood sugar went up around 2.6 mmol/L after eating 200 grams (6.1 to 8.7), ruling them out as a part of my diet for now - I usually get very little rise (if any) from the foods I eat. 100 grams had only a slight effect - up 1.1 mmol/L.
I will be retesting the effects of them after I get my freestyle libre sensor to try to determine if they cause less spikes when prepared in different ways and when eaten with different foods and I'll post my results on the forum once they are complete. I will be checking for the idea of making the starch resistant by cooling them as well to various degrees, eating them cold vs rewarmed and so on. I will also be trying this with a whole bunch of other foods and drinks plus various sweeteners. Hopefully the data (while only a small sample size) will provide some useful numbers.