This is fabulous, thanks @Linux4 !
One question: I see that the installation guide (both on this thread and on the official Lineage website) does not mention anymore flashing the vbmeta.img file together with the recovery, as in:
heimdall flash --RECOVERY recovery.img --VBMETA vbmeta.img --no-reboot
Does that mean that it is not required anymore to flash it separately?
Yes it's no longer required.
If you only flash recovery you don't need the disabled vbmeta image, and the ROM zip already includes the one you'll need for the ROM to boot