Raintre Nursery has a new cocktail tree listed on their website. I already ordered one.
“Fruit Cocktail(F/PG/HR/S/IT/L)/St Julian A
Gardeners love to talk about the soul soothing value of fruit growing. However, the value of shocking your friends and neighbors with your hobby is too often overlooked in literature. Imagine one tree that grows Frost Peach, Puget Gold Apricot, Hardired Nectarine, Stella Cherry, Italian Prune and Lapins Cherry! It is on a prunica interstem which makes it possible to have cherries on the same tree as the others.”
Zee Stem on Citation
Allows cherry growers to use appropriate peach/plum/almond rootstocks for the planting location, precocious and dwarfing when used with Citation rootstock. Improves fruit quality
My guess is that you will need to make sure everything grows in balance with each other, Summer pruning. I had a 3 in one peach, the weaker slower graft eventually died off. I hope that you grow it in a larger pot over time.Good luck with it!