Responding to earlier comment which indicated grafting is hard. Grafting a scion onto rootstock can be challenging. It is a skill to be learned, like any other, so don't give up too easily. Good instruction(s) is important.
Much easier is cleft grafting. It requires you have tree(s ) to start with. Given that, it is a super way to expand your varieties, all on the same tree if you wish. Below is a link to a description. Many video instructions can be found online.
You can also use this technique to graft onto a fresh stump. Cambium to cambium is the key, whatever the type of graft.
https://www.motwebpageherearthnews.com/organic-gardening/grafting-apple-trees/