If anyone finds this thread attempting to do what I was trying to do:
I never found a way to get OS-prober to notice PVE's boot-partition, but I did find a way to do what was my initial wish.
I used "efibootmgr" to list all partitions and their...
I would most like to not replace GRUB as the main bootloader for my production machine if possible.
But the tip on efibootmgr was actually good, at least helps in getting correct info on where the boot binary is and on which UUID etc :)
Well... I have one cluster and a few standalone setups in my home that run proper PVE.
This specific one is going to be used as a lab setup only, using some hardware I don't have in the other setups and cannot really afford to buy for them...
I run a dual-boot setup on my main workstation for testing purposes.
My main driver is a fully updated Manjaro Linux.
I boot said Manjaro installation using GRUB installed to the NVMe0-drive's EFI-partition.
Proxmox is installed onto NVMe1.
When...