I keep a PDF of that layout on my desktop, for when I have to look up a character.Those are all available on the U.S. International keyboard. All you have to do is enable it.Sure, if you remember where they are. 😄 It would be an improvement if all US keyboards came leveled for that layout.
° ¿ « » https://en.wikipedia.org/wiki/British_and_American_keyboards#/media/File:KB_US-International.svgHow about αβψπλ etc? Are those easy to type?
Of course on windows I use wincompose which has lots of extra definitions that are totally crazy such as compose+t+f giving: