I am not sure I understand what your problem is, but after playing for a while here is the result:

you can have all those strange symbols by using key combination - see attached pic for details. It is produced for Brazil language and variant none. you have several variants to play with.

Shift-6 is used to put diaeresis (double dot) on the next symbol.
Key next to P is used for acute.
C cedilla has its own key.

To produce picture like attached and check your current configuration:

as root in xterm

xkbcomp -xkm -i 4 :0.0
xkbprint -eps -nokc server-0_0.xkm

the result is server-0_0.eps file, open it with your favorite graphics editor

hildon-im-xkbtool --list should be used to get correct id of your keyboard (-i parameter of xkbcomp)

Hope that helps

Edit: sorry for the image quality, maemo.org done this