So what happened? Did you find a way to scratch it even though both your hands were tied?
No - after a few days I'd have an emotional meltdown where I stopped caring about the ideals that motivated me to honor the commitment, and start scratching it (and generally freaking out and trying to cry and writing journal stuff) while I was awake. I decided in the end that the tying myself up was a decent way of forcing the emotional expression that the eczema had been masking.
But I think forcing it is a good approach only if you can't get to it an easier way. I'm still working on the eczema problem but trying to take a gentler approach, and it would probably cause me more harm than good to tie myself up over it now.
Also, forcing it has an element of creating problems where none might otherwise exist. It was about a year and a quarter ago that I was doing it, and partway through the process, real-life circumstances intervened and I decided I'd better save my energy for where it was needed more.