M.S.
I don't use a bread machine, but have you checked out Bob's Redmill? They give recipes for both bread machine and by hand. I would just try substituting the rice flour with the oat flour. It shouldn't hurt and should turn out just fine. I use a blend of different flours to make my bread. I do it by hand, I like to do it that way, and it turns out delicious.
Just a heads up: You can take the special foods off of your taxes as a medical expense. What you do is take the cost of the food and subtract the cost of regular food and what you have left over you can claim.