Portuguese keyboard without dead keys variant

General system
#1 
localectl list-x11-keymap-variants pt

mac
mac_nodeadkeys
nativo
nativo-epo
nativo-us
nodeadkeys

There is no sundeadkeys variant to choose from. Any help please?

Thank you.

#2

Isn’t that no dead keys? Without dead keys is the same as no dead keys, or am I missing something…

#3

There is a variant variant named sundeadkeys. Calamares has it but it is missing from my system.