Have you tried this one ?
My choice is "US International with AltGr deadkeys". The deadkey behaviour in simple "US International" is very annoying for programming: you have to double-tap every key that could be an accent, such as single quotes or backquotes.
Uh, did you not even bother to click on the link or something ??
The easy access to all Greek characters (and more math symbols) alone is great if you work in a math-related field !
Look, I think it's great that this thing exists and grateful that you mentioned it. I may even suggest it to some of the French-speaking juniors I work with.
It does not, however, address the issues of the person you were replying to. And I know because I'm in a similar position to them.