Wow!! What a GREAT idea! I'm trying to learn to use my non-dominate hand as well, and so far have only done so where I know I have total control. But, there's other areas where I've thought I should give it a try there, too, and lack the stones to do it.
I think, though, I'll take one of my ebay butter knife razors that I haven't sharpened yet and use it instead.
Thanks roughkype!!
Kent