How did you solve this problem? How is it possible to create merge requests in gitlab for additional devices as it’s not possible to fork the easy installer project?
Is it wise to add a relock step for the FP4 at the end of the easy installer steps as in case something went wrong during installation it might hard brick the FP4 ?
Might it be wise - in contrary to the steps mentioned in install instructions - to flash partitions of one slot only - so in case it fails you might still switch to other slot (although - well - in case in case of failure you can’t change slot on a locked device anyway… 
)?
What did you do when the images linked in the yaml are not shown in the installer?