Is there interest in Nakayama Kiita stones? They're very fine, natural Japanese stones. Unlike Asagi stones, they're fast and give some feedback. I didn't list this in the B/S/T because Nakayama stones aren't for everyone. You have to be a dedicated straight razor user because they're expensive.
I know a 17th generation dealer/miner in Japan and I asked him for high quality Kiita stones. I bought one stone, which I will test once it arrives. If it's good, perhaps more of you could buy.