I believe you can use sweet cherries to pollinate sweet cherries.
Sources of cherry scionwood:
Burnt Ridge Nursery Has 19 different cherry scion
wood varieties. Search cherry scion on their site.
Fruitwood Nursery Has 24 different cherry scions.
Skipley Farm Has 14 cherry scions.
Some sources only list what's available just before they start taking orders. Most sources begin taking orders in December and start running out of items as early as, possibly, mid January.
There's also the
Scion Exchange where you can exchange scions with other members. I'm a new member and haven't done an exchange. I'm wondering if scions are shipped to members if you don't have a variety that the member needs.
I have successfully grafted a Golden Delicious to an old Yellow Transparent
apple tree and a Shendoah pear to a Bradford pear. I also have a young
apple graft that starts out with a semi full M111 rootstock to which I grafted an M7 semi-dwarf. That gave me a semi=dwarf tree on a semi-full rootstock. To that I've so far grafted 4 different old apple varieties. One problem with that is that some of the grafts disappear so it becomes difficult to keep track of what's where. I've also planted 4 different bare
root apple seedlings in one oversize hole.
So far it appears to me as though it takes just as long to get production out of a graft to a mature tree as it does from a young seedling. The Golden Delicious graft to the mature Yellow Transparent has gone 4 years without production. Golden Delicious is said (by some) to be a precocious variety. But then one graft is not a lot of experience.