I used sorghum flour, white rice flour (didn't notice it was supposed to be sweet until I was in the middle of putting this together), cassava flour, and tapioca flour. I used coconut oil for the neutral oil. Despite substituting so much, it turned out a fine dense loaf that I'm happily snacking on.

I might still try the other one sometime with the freshly grated ginger. I didn't want to fuss with that last night.