Update!
Last night I decided to make a stir-fry with my no-beef flavor (you can read the full adventure
on my blog). So I took the seitan out of the freezer, put it on a plate, and used the defrosting poultry setting on the microwave for 1/2 lb and it worked beautifully (it was about a half pound cutlet, btw, so it seems you can use the poultry setting by the weight of your cutlet you are thawing). Pictures on the blog, but holy crepe that was the best stir-fry I've ever had.