EDIT: this comment make wrong assumptions /!\
After investigating, I found out that the KDE frontend for oem-config used to have a final screen with disabled Back and Continue buttons.
This was removed 12 years ago as part of:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/540929
I guess making an empty page with disabled Back and Continue buttons would be the way to go.
EDIT: this comment make wrong assumptions /!\
After investigating, I found out that the KDE frontend for oem-config used to have a final screen with disabled Back and Continue buttons.
This was removed 12 years ago as part of:
https:/ /bugs.launchpad .net/ubuntu/ +source/ ubiquity/ +bug/540929
I guess making an empty page with disabled Back and Continue buttons would be the way to go.