I've done a lot of cooking
& baking with brown rice flour. Never bread though. Corn is pretty versatile as well, as are the myriad of other grains out there. Even oat flour, & sprouted breads (made from sprouted grains).
Try sourcing information from Whole Foods typs stores, as they cater to exactly what you're asking about. And my other half found all kinds of the above when I gave up wheat for a while.
Wish I had a recipe or 3 for you, but cooking
by eye is an old family
BTW, other than for sandwiches, you really don't need traditional "bread", so a lot of alternative items can be added to one's diet. Not that sandwiches on sprouted breat, or any other type of bread are bad. Just different. And are usually a lot more tasty & healthy to boot.
PS: Have you played around with grinding your own grains yet?