Stupid or smart grafting logic?

So i have an idea that may or may not work. If you had a seedling of a fruit tree, and you cut the seeding 2 inches from the base, then graft it back on, would the tree fruit faster, or is that not how it works? I feel if this is true, it could save breeders a lot of time.

I'm not sure but I think that would only serve to stunt the seedling.  I could be wrong.  The trees I grafted two years ago are only 2' tall.  The root stock was 1' tall when I cut it.  I'm guessing in those two years it would have grown more than 1' if I had just planted it and let it be.

I don't think it will work. The effect of grafting a scion from a mature tree onto a seedling rootstock is well known: the top still thinks it's part of a mature tree and will try to fruit if provided with enough nutrients from below. Your trick would just be putting the halves of a seedling back together, without the maturation triggers having come into play yet.

no, to my understanding, that's not how it works. i think the conventional wisdom about grafted trees fruiting sooner is based on the fact that the scion was taken from a more mature (read: already fruiting) tree. even then, if grafting onto a skinny little seedling it would take quite a while before fruiting. as far as i know the fastest way to see what a seedling's fruit is like is to graft a bit of it into the branches of an already-fruiting tree.

About the closest method to your idea ---i have only read about this never done it ---is nut grafting ---sounds like a weird kinky jokes opening line ---but was done for american chestnut restoration .