I have bad news for you. Rice doesn't actually keep salt dry and in fact, it gets wet and weird. I think rice doesn't work in salt because salt attracts moisture. My husband puts rice in the white pepper shaker to keep the pepper from clumping and packing down and that does work. But pepper doesn't attract moisture. So maybe it would work for your bulbs as long as they were good and dry to begin with. The danger is if the rice gets damp, you will have instant mold. Instant Zephyranthes koji doesn't sound good.