I glazed through the article and didn't see it, can we use the same shortcuts as PC? I need é á ç easy to type, i don't write in English most of the time
Diacritics such as the mentioned by the person you're replying to are usually not implemented hardware-wise but rather require the OS to correctly understand key combinations. So you can't expect the system to simply interpret certain rare keycodes, because there are none.
While some languages may use special hardware keyboard with special physical keys for their characters, such as Swedish with their äåö on the right, other will use international qwerty with special characters implemented as combos, such as Polish with its ąśżźćńłó, which are typed using AltGr
Fair enough. The OS should handle these characters automatically based on the selected language and I would expect Android to; I just don't know for sure that it does.
My point was simply that these characters/symbols are Unicode so a keyboard running QMK or similar should be able to send them directly. However, you are correct that it shouldn't be necessary.