OK, I have done a succesful install with encrypted / and /home using ROME Plasma6 x86_64 ISO. How to install OMLx with encrypted / and /home
There may be other ways to do this but I have something I believe will Work_For_Me. And this should also work for other users as well.
Edit: This so far has been done in VirtualBox. I do not really see the need to have encryption in VBox. So for me personally the next goal is to see if this works on my laptop in a multi-boot scenario.