2 or 3 are simplest.
There is no doubt on Andriod or Windows you have to install something extra. I don't know about MacOS or iOS. It's feasible on UnIx / Linux/ BSD etc to directly edit, but it's not beginner stuff. Mapping the extra x86 Media PC keys on GUI on Linux is easy. Adding characters to Compose key by editing a text file is easy. Remapping control keys is harder.
The app I got for Android is a bit limited and was really for the older Androids that ONLY did a USA keyboard layout on a physical keyboard (USB or BT) so as to have some other layouts. I couldn't add an AltGr on keyboards that don't have one (though supposedly its Ctrl + Alt_ and on most Android layouts the AltGr matches Windows layouts not Linux, which is odd.
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