How do I enter accented characters?

In Text+ nodes and the subtitle text entry it doesn't seem to be possible to type accented characters.
ALTGR+accent followed by the letter doesn't work, entering as unicode with CTRL-SHIFT-U then the hex code doesn't work.
Switching keyboard layouts doesn't appear to work either.
It's getting really tedious having to copy and paste half the vowels in when I'm subtitling. Is there something obvious I'm missing?
Edit: Even when I copy and paste in the symbol it doesn't show up in the subtitle.
ALTGR+accent followed by the letter doesn't work, entering as unicode with CTRL-SHIFT-U then the hex code doesn't work.
Switching keyboard layouts doesn't appear to work either.
It's getting really tedious having to copy and paste half the vowels in when I'm subtitling. Is there something obvious I'm missing?
Edit: Even when I copy and paste in the symbol it doesn't show up in the subtitle.