I saw a presentation by a tree mover showing the process of moving those mature trees... pretty insane.
With water misters on the truck for the entire distance, they were able to move trees that seemed entirely impossible....
And still.... The way that they've been able to preserve old timey varieties of apples is through grafting... get someone to graft a butt-load of grafts on various rootstock, and.... you could have large apple trees and dwarf apple trees... all the same tree... and as clones, they would be the original tree.
The difficult part is going to be whether apples would even grow in the new location...
At my previous garden, I had beautiful natural crab apple trees...
but where I am now? apples die as soon as I plant them....