the problem is small, if you cools your sac and egg with ice water.
i dit it often for horny tortureplays.
after ten minutes of sticking the tied sac in a big cup with ice water the sac is complete numb and your eggs too!
so the clambing would be no problem - complete painless!! and with a little cooling after the clambing from time to time you can decrease the hurts in the howers after the eggs death, until the bodie has accepted the new blood curcuit in your bellow, when the pressure in your unclambed cords rests or stumps is went back to a normal situation. Then you are feeling well again....