There are at least two of us here in the San Gabriel Valley growing cocktail longans. I also live in a very small residential lot with very limited growing space. They are not easy but the grafts can be done. I have a kohala tree grafted with four other varieties and the entire tree is blooming nicely. Since you're not too far away from us, this will probably work for you too. The best time for grafting is spring. Second best time for me is after harvest in late fall. Also done it in December with lower success rate.
I like whip grafts. Veneer works better for smaller scions and thicker roostock/branch. Cleft works best on same diameter scion/rootstock branch.
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It's approaching late fall here. I have a 10yo seedling that has done zero, and two marcotted cultivars that are now going onto the unproductive seedling. Wish me luck.
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Please report back on your progress. I would love to read what you did, when you did it and how successful you were.