You could dig these out when they are dormant during the winter and practice your grafting skills if you wish.
Here's another possibility. Lat year I purchased a grafted Norris #1 from Hidden Springs nursery. After receiving it the graft died. It was replaced free of charge by the nursery. I chose to pay for shipping.They were very helpful and always answer my questions.
Despite the loss of the graft, I ended up with a shoot from beneath the soil and left the plant on the side all summer long without paying attention to it, except watering it along with my other plants.
It appears that this shoot will be loaded with fruit this year. I don't know what they will look like, nor the variety of the rootstock. It turns out that even the nursery don't know what the rootstock variety is. If the fruit turns out to be of poor quality, not that I'm good at it, I could always attempt to do a graft.
In the photo you will see the new Norris#1 on the left and on the right the old plant showing lots of flowers on the new shoot and where the graft totally died.
In the past I visited Matt Family orchard in your area. He has lots of Li jujubes, I was told that he has one tree with a smaller fruit that the other ones. The graft initially died on that one but a shoot grew into a fruit bearing tree of smaller size fruit but still a desirable flavor. Unfortunately I did not have a chance to tell which is which at that time.
Good luck with it.