Haha. This is the way. For real though, just go with what you’re comfortable with in both time and headache. You know UNRAID and it worked for you in the past. Keep that as your prod box and then scrap together a lab, which you already have the makings of. Proxmox is excellent but without two hosts and shared storage it’s not really any net gain for you, it seems, vs running something you are comfortable with (UNRAID).
EDIT: INB4 someone gets sassy — HA is only “supported” with a minimum of 3 hosts. But it works just fine with 2 and a third host (raspberry pi or VM running outside the cluster) using qdevice.
This looks very cool. One of my biggest issues with Jellyfin is its UI. So I just stay with Plex. There are some other features that keep me in Plex but it’s mainly the UI. I’ll be starring this and keeping an eye on it! Well done.