> Though I prefer the X11 compose sequence business where you type <Compose>'a to get á and so on. X11 compose sequences are a lot more intuitive than the Windows U.S. international keyboard because there's no ambiguities, so, for example, a cedille is just <Compose>,c whereas in the Windows U.S. international keyboard layout it's 'c

That sounds pretty good indeed. Any idea how could I go about setting this up under macOS?

> Also, if you program or use a shell, then the Windows U.S. international keyboard layout is just unspeakably unbearable.

I have indeed a couple of little, weird problems when working in the terminal. That's inconvenient but still beats switching between 3 layouts 50 times a day.