liveinit: Use Shift-AltGr as the Compose Key, seems to be the sanest choice.

As documented in file "/usr/share/X11/xkb/rules/xorg.lst":
lv3                      Key to choose 3rd level
lv3:ralt_switch_multikey Right Alt, Shift+Right Alt key is Compose

And as explained in https://help.ubuntu.com/community/ComposeKey :

There are four levels of keyboard entry. Selecting a level involves holding
a set of modifier keys down, this changes the function of all the other keys
on the keyboard. The levels are, by default:

Level Modifier    Keys produced
-------------------------------
1     None        Lowercase letters, numbers, etc.
2     Shift       Uppercase letters, symbols printed on keyboard, etc.
3     AltGr       Extra symbols not printed on the keyboard, some dead keys.
4     AltGr-Shift Even more symbols, more dead keys.

Dead keys are keys that appear to do nothing at first; they apply an accent
to the next letter you type.

Third and fourth level choosers:
Holding down the AltGr key and pressing another key will produce a third level
character. Holding down the AltGr and Shift keys (the order can be important)
and pressing another key will produce a fourth level character.
Note that some combinations are dead keys; an additional key-press is required
whereupon a diacritic will be added to the final character keyed.

Compose key:
Keying the combination Shift+AltGr (in that order), releasing these keys,
then entering two other keys will produce a special character.

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