I’ve been looking for something like this for last last five years, at least. Ergonomic, adjustable to the nth degree, a built in, well design laptop arm. Expensive, but not completely in the stratosphere. This is the Interstuhl Mitos Mobile MS 14. And it’s nowhere to be found in this country, as far as I can tell. It may not even be in production any more.
Back to the drawing board.