Seems like you’re nesting virtualization too much. Stick with 1 level of virtualization. If it’s a server, I’d use proxmox on bare metal. Its a server so split services per VM/container. Install OMV on its own VM. Another for docker, with docker services ran by a non root user.
Dam I just bought mine SD last month. I wonder if I should return it and buy the OLED. But I saw the 512GB cert refurb are like $200 off now so a second steam deck as a back up would be nice.