I've always used American keyboards without dead keys so I can't really
help here. But an alternative is to set up a compose key, e.g., with
$ setxkbmap -option compose:ralt
to make it right alt. Then you can press (in sequence) Alt ' e to get
an e with acute accent, etc. This is configurable as well; you can set
up a file in ~/.XCompose if you want to change the default bindings.
Note that it uses Latin1 only by default, but you can get full access
to Unicode with LC_CTYPE=en_US.UTF-8 set.
--
Anthony J. Bentley