No, the TOS specifically states that they're non-transferable and only the original purchaser is allowed to use the license, meaning you, so even giving him your login creds would break TOS as he's not the original purchaser.
You can skip the virtualization with Proxmox and just run HomeAssistant directly on HexOS and run HexOS on bare-metal. For now you'll just have to go via the TrueNAS UI to do it.
HexOS needs minimum 2 drives so if that's all you have then it won't work.
You won't be able to add it to a storage pool and just use it with the data that is already there, you could connect it and copy the files from it (this will require going beyond just using the normal HexOS UI, you'd have to mess with terminal commands) to your storage pool if you have a storage pool with drive.
> What I'm not sure about is how low can the idle draw be? I don't want anything drawing 60W draw on idle. Under 10W idle draw would be OK. Don't want a massive bill for electricity. And I just don't know if that's achievable on this platform.
You'd have to measure how much it draws.
> Also do I need ECC memory? This CPU does not support it.
There's definitely benefits from having ECC memory but it's not a requirement.