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My experience grafting to seedlings that low on the trunk has been pure failure. Most continually sent up new trunk shoots that I pluck off until the plant dies, a few just gave up the ghost a month or so in. Grafting about the first set of leaves with seedlings has been successful for me.
I tried a seedling graft as well and waiting to see if I have any luck. I went a little higher but please post your results as I’m curious.