I stopped pulling when I started taking MSM methylsulfonylmethane for hair growth. I take 3 gr. daily with the same amount of vitamin C and have been pull free for months now.
Additionally I take inositol. This was recommended to increase hair growth also and made other people stop pulling.
The 3rd option in NAC (with a lot of vitamin C to prevent kidney stones).

To prevent the itch it is helpful to wash the hair often enough (in my case with anti-dandruff shampoo). And to use the dominant pulling hand for the computer mouse.

I am 47 and had 35 years of "experience" before I was able to stop.