I've seen it done once by an expert. I think the most important part is the cut. A clean, sharp blade at a big angle for more surface contact is what he did. I think he just used scotch tape but years later when I checked the trees I couldn't find out if it worked or not. I think so.

Many things will work for binding grafts together. A wide rubber band will work on the grafts you have mentioned.

Grafts take a few weeks to callus and begin growing. Dont get in a big rush to remove the binding. If you remove it too soon you can have your scion break free. Monitor to make sure your binding isnt girdling the new growth.