pw=password.
Maybe you just install pve on 1 ssd. Then partition the 2nd one for pve and an additional image use, "mirror" pve over, config with proxmox-boot-tool, test by removing the 1st ssd. When iO do the same to 1st ssd. After having unencrypted pve and free partition, doing luks onto, setup 2nd pool (rpool still exists).