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why would you want to do that?You will only stress both scions more than normal grafting. But I do seem to remember a youtube video where they were doing this inside a greenhouse.
It just from a time perspective. I would be faster, one or two months ahead.There are some benefits using an interstock.Say you have calcareous soil but can't use FD to dwarf the tree.
calcareous soil? Use US897 or Marumi kumquat as rootstock. Marumi is even more dwarfing than FD.