Is it possible that they are viable? What does embryo rescue entail? There is a near zero chance of American persimmons around here. I am probably the only fruit grower for miles around (apples and blueberries excepted)
They looked like mature seeds. Clean them well and make sure they sink on the bottom in a bowl of water to make sure they are viable. The dried seeds then place in a Ziploc sandwich bag and stratified them in the refrigerator over winter. Plant the seeds in pots in May then watch them grow.
I just did the sink test and all 5 sank in the water! How exciting!! Now they are cleaned up and put in ziploc bag in refrigerator.
I often get seeds but they are soft and can easily bite through them. This is the first time I found (possibly) viable seeds.
Yes, even if it could have crossed with an American persimmon chances are it was some hybrid other than H118 fruit! So I think you have a good chance of something new!
Dennis