Have you thought about having buttonholes established? Once the buttonholes are ready, there is little to no pain (at least for me) as you are inserting the blunt needle into the same track over and over again, like an earring hole.
My fistula is near my wrist. They try to space the needles two inches apart, so it is near the wrist and the middle of the lower half of the arm. I am lucky the scar is tiny, but the artery (?) is a bit narrow near the wrist and that hurts the most.