Why do I make things more complicated for myself? If I started this project again I would do a lot of things differently. I am figuring everything out as I do it.
I was having trouble getting the bricks to sit properly on the formwork when it is almost vertical. They keep sliding down or twisting. So I decided what I needed was something to start the first brick of the row, so I could build off of it. What I came up with was a kind of cradle for the brick. It can balance on the wall and I can adjust the angle as necessary.
Then I realized that I didn't need any of that. Some binder clips work just as well. I can attach them to the existing formwork and support each brick that needs it, rather than just the bottom one.