i grafted 2 varieties on oposite sides but at the same height, like show on the pictures i posted here.
And a 3e one immediatly above it. (2 on oposite sides to form “horizontal” esapaliers. And the 3e, to continue the stem.
I did the grafts on rootstocks that where braking dormancy. and rubbed off the buds of the rootstock. This might have halped in making 2/3 buds grow a shoot.
Also the close proximity helps i think.
I would not graft them far apart. im pretty sure only 1 would sprout than. And surpres the others from growing a shoot.
Also put the smallest bud in the 3e position (slightly higher then others) in the hopes it would sprout a little later.
im still experimenting with it though. So not sure i can recomend it. It’s definitly not a garanteed and reliable way. But might be worth a try if your out of space/rootstocks.