Author here. Happy to answer any questions or take any feedback about this post.
Really nice, exactly what I need just now as I'm setting up a remote workstation/part-time server at my families farm, but did not have a motherboard with IPMI/iKVM at hand.
Oh, and thanks for using Proxmox VE! Was positively surprised when I saw our installer flash up out of nowhere :)
Wow, thank YOU for making Proxmox! I'm switching over after three years of Kimchi[0], and Proxmox does everything so much better.
Glad to hear that you like it!
For (integrated) mouse support you could take a look at a project from a good friend and colleague: https://github.com/Blub/netevent
Allows passing along arbitrary input events over the network and more.