I think this concept works. I install the system on Live Media using basestrap with most of the packages from Packages-Root and Packages-Desktop and others such as zfs support, configure it for RAID1 and ZFS support, and then copy the settings from desktop-overlay from the Manjaro KDE iso profile. Then chroot to the install, edited the fstab to automount /boot and swap partitions, and configure the system with the 7th step of this tutorial, and set up systemd-boot as the boot loader. Finally, created my user account with useradd -m -G audio,lp,optical,video,sys,network,scanner,power,wheel -s /bin/bash USERNAME and systemctl enable sddm.service as suggested in Install Desktop Environments - Manjaro. The system boots into KDE successfully and get the feeling that is close to the official Manjaro KDE release 
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I will find some time to draft a tutorial for this, as I found the guidelines for ZFS installation on the forum is too fragmented.
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