I thought grafting went the other way. ie you take scion wood from a tree that is already bearing and graft in onto a rootstock. That wood that is grafted on is already "programmed" for bearing fruit. That's why grafted plants will bear early.
My main experience with fruit trees from seed has been with peaches. They pretty reliably fruit in their 3rd year. I've also planted quite a few dozen chestnuts over several years. So far just one has fruited/nutted and it did it 18mths from planting the seed! I have some plum and apricot seedlings that are 2-3 years old but none have fruited yet.
The peaches have been smaller than the parent fruit but they're good flavour and freestone so easy to use for bottling/canning.
I've got this rising on my bench/counter. I put mine in a tin as I want square slices this time. It looks good and felt good as I was kneading it so I'm looking forward to the final result when I cook it this evening.
I haven't read all the posts so I may be repeating...as well as throwing in vege and meat scraps as they come to hand, I add a slosh of vinegar. It doesn't affect the flavour of the stock but is said to help extract the minerals from any bones that are in there.