Thx for sharing @galodoido and @Adam.
Also, doesn't the ´Alt gr´+´{a,b,...}´ keys input some accentuated letters (as well as ´~´+´{a,e,i...}´)? I use these on a ARM Chromebook with ChromeOS (which is based on Gentoo Linux) and US keyboard+layout.
Note « Gemini expedited on June 15. » so I can't check myself, yet.