I don't care for the astringent (soft ripe) fruits so I only have multi-grafted non-astringent persimmons on my trees. I haven't found any variety that is not compatible yet. Here's what I have grafted on Giant Fuyu , Matsumoto, and Hayakume trees.
1 Chocolate
2 Coffee Cake
3 Fuyu
4 Great Wall
5 Hayakume
6 Izu
7 Jiro
8 Kurokuma
9 Maru
10 Matsumoto
11 Saijo
12 Suruga
Just so you know, if your #8 (Kurokuma) is the scion that you got from me, there are a couple of issues here.
1. It isn't a Kurokuma. It's a
seedling of Kurokuma. I started it from a seed that I got from a Kurokuma fruit that I ate at a persimmon tasting at UCANR. I know that the fruit I ate was a Kurokuma persimmon, but no one knows what the pollinator was. I'm sure I made this clear before I sent it to you, but it might have skipped your mind; we had a nice exchange, and probably covered enough details that it would be easy to forget this little bit of info. So the fruit you get from that scion might be like Kurokuma, but it might be totally different, since the gene pool got scrambled around in the midst of all that hot sex persimmons have.
2. Also, if this seedling takes after its Kurokuma parent, it will be an astringent fruit. I understand people liking the ease of eating non-astringent fruit. You don't have to worry about whether the thing has been pollinated, or treated in some way to eliminate (hopefully!) the astringency. But for the record, I'll say that I haven't ever tasted a non-astringent persimmon that has quite the complexity of rich flavors that Kurokumas I've tasted have had. (And I tasted a wide variety of persimmons at the UCANR tastings in two different years.)
3. I'm still waiting to get fruit from the Kurokuma seedling. None yet. I hope it will produce for the first time this year. But one thing is clear already: I have a multigraft persimmon tree, and this is the 2nd year in a row that the Kurokuma seedling branch is the first branch to break bud. In fact, I went out to see it today, and its buds are opening now. Matsumoto Wase (the scion I got from you) and Tsurunoko ("Chocolate" from Dave Wilson Nursery) are still dormant.
I hope that helps.