Thank you very much for the suggestion!
I tried to do those steps, but, unfortunately, once I have everything mounted, the Agama installer then doesn’t find any devices available for installation. I was able to make it find the EFI partition, but I think one of the hang ups is that when you select the device, then go to details and configure partition, it won’t let you pick a PV as it expects a mount point and you aren’t mounting the PV.
I’ve attached a couple of screen shots.
I have to say, I’ve used SUSE/openSUSE for a long time, and, for a major release, this is majorly disappointing after being “spoiled” by YaST’s capabilities. I much appreciate all of the effort being put in upgrading the installer, but (IMHO) this was not ready to be included in a release.

