I have a small plot of land where a few old trees exist.

For what I could gather, these are heirloom trees no longer commercially available, probably even local varieties: one pear (possibly two), one apricot, one peach and one cherry tree.

I would like to reproduce these trees without the need to use root stock.

Talking with arborists always returned the same kind of answer: not commercially viable, too long to obtain fruiting trees and even an argument that the new trees would become "wild" and never bear fruit or only bear unedible fruit. This one I find particularly wild...

Does anyone have any sort of experience trying this? Can anyone recommend a technique?

I've read about a technique that recommends wrapping branches in cloth, with a lump of soil in contact with the wood to promote rooting but the trees I want to prioritize are not eligible for it as they are extremely old, with very thin and frail branches.

Are there any others you would recommend or suggest?