Hi!
Hinted by Evdev and new gdm options, I tested gnome based kickstart files from git without the xorg keyboard patch and it works. I can sucessfully choose a portuguese keyboard in gdm and after entering in a gnome session, applications correctly detect my keyboard. Also, gdm is presented in portuguese language.
I committed these changes to pt_PT kickstart files based on gnome. I also fixed the template/patch for pt_PT language.
Hopefully, I will have the same results on all pt_PT ks files and the patch is no longer needed. GDM looks great with those new features. :)
Best regards,
Pedro Silva