Korean input method with a French keyboard breaks some characters

Hello,

I tried to setup Korean input on my laptop and I ended up being unable to type some symbols.
On a French keyboard, the right "Alt" key is "Alt Gr", and is required to type tilda, pound, curly braces, pipe, brackets, @ ...
And the problem is that right "Alt" did not work as intended after that setup.

This seems to be caused by the option in the Korean keyboard layout : "Hangul/Hanja keys on Right Alt/Ctrl", which I believe is checked by default. The problem persisted even after removing the Korean keyboard.
Which is really a problem because then you can't even see that option anymore !

I know this use case is probably very narrow and I quite don't see how to fix this problem easily.

Also I think I had to fiddle with .xinputrc to get Korean input to actually work but since I did try things before getting something I'm not sure this was the final solution.

Kind regards,
Benoît Labaere