The post was intriguing and got me thinking that maybe I should learn Godot. However, it seems like Godot doesn't support calling out to external libs directly using GDscript or loading one that isn't wrapped by GDExtension. Is that a correct assessment?
you can use OS.execute() to run console commands and run other binaries, but if you need something more advanced you can probably use C# instead of GDScript, which wouldn't need GDExtension.
Thanks. That doesn't fit my usecase. It was a good read though, and something I'll try to remember next time I start a GUI project. Maybe calling/loading non-GDExt libraries with GDScript might be possible by then.