I don't know much about this, but would it be worthwhile to start apples from seed, and then graft onto (some of) the saplings that make it?
This won't produce many calories, but my suggestion was to plant ridiculously densely and to eat sprouts, then very small plants, then slightly larger plants, maintaining the beds at a planting density appropriate for the age of the plants.
Ever since I found this suit I've felt strange new needs. And a tiny ad:
Tomatoes! Ha! Anyone can grow that. Amaze your neighbors, grow your own shirt!https://permies.com/wiki/92731/fiber-arts/Homegrown-Linen-transforming-flaxseed-fibre