You can get a 50k GUI with FLTK in less than half an hour, and it compiles to a static binary. The API is at about the same "complexity" as Tk and the bloody thing is in C++.
Get Dev-Cpp; click Tools -> Check for Updates -> [scroll around to find a recent FLTK devpak -> Select -> Download.
There is even GUI4CLI, which is a wrapping scripting language which generate GUIs for CLI utilities. It's used by Avanti, which is a GUI for ffmpeg and avisynth. It's about the same complexity as a clean tiny, basicish, shellish pascal:
