Dont start with Acaule seed, this are the most frustrated ones,
start with reginae and try it with that species.
if you grow up succesfull this one from seed then you can get to other kinds.
Acaule is tricky in flask and after. Pubescens is not easy to germinate too.
So for starting I recommend Acaule, she works well from dry seed too. The others are not easy from dry seed.
heard that Acaule is possible from dry seed, but only heard from one person till now.
If you want I can cross a reginae alba fro you, tell me what you want as pollen on it, or I can make a pure one for you, and send you the dry seed.