plus one, I would love to configure a folder of markdown/txt(+ eventually images and pdfs) files that this can have access to. Ideally it could RAG over them in a sensible way. Would love to help support this!
touchscreens don't have to be small. one of the only pie menus I can really think of in the wild is Adobe Illustrator on iPad, which is relatively interesting because its an "ipad first" app of sorts. its separate than their desktop apps, and was designed for the larger tablets, not a small phone.
the menu itself is pretty good, especially with the Apple Pencil, which you'd be using to draw on the iPad. Image editing/3d modeling software tends to need a lot of UI, and I think it makes sense for the most part. these tools are hopefully used by everyone. that means more sporadic use — if I'm only opening your app a couple times a week for a couple minutes, I probably won't remember the keybaord shortcuts. not to mention people who are unfamiliar or don't use keyboard shortcuts at all. anyways, bit of a rant since it doesn't answer your original question, but we should consider how to make our computers computable by all users.