I believe I can address the first two points for you:

> Scalable text support a la TextMeshPro (sdf-based rendering)

Someone in our Discord recently found a way to scale their project UI correctly according to screen DPI, not sure if that solves your problem or not. Their project is also open source: https://github.com/derkork/openscad-graph-editor

> - the in-editor console is horrible. it frequently tells me "output overflow, print less text!". wtf?

That can be solved by upping the debugger output limit in your project. (https://github.com/chickensoft-games/go_dot_test/blob/1fb342...)