The page turning button is the Square box...IF I am correct. Have you tried using it sideways? Then you can hit the button either with the left of right thumb whatever your use to on the K3.
Also to give your hands a break try rubbing the inside area of the elbow til you find the nerve that controls the thumb & 1st finger Rub til the pain lets up then firmly hold the thumb pull & give a quick tug! Repeat as needed!
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