Re: bébé
Compose + e + ' produces é, compose + e + ` produces è. Simple. I don't think I've encountered a keyboard yet that doesn't have the ` key on it somewhere.
You can also, if you're wondering, get a ´ by typing compose + ' + ' which is... well it's `interesting´ I suppose.
At least that's how it is on debian. I'm going to assume it's the same on OSX.