Interested as well. There is a review on the Aliexpress page stating that OPNsense via Proxmox works fine:

https://www.aliexpress.us/item/1005006030794589.html?gatewayAdapt=4itemAdapt

I have to admit, that this might be true the very most cases. But there are more reasons why servers still have a video-port.

Cool, So actually something one could build out of anything with an USB, Ethernet port. But not sure how to add the Display receiver… They using a RPi for this as well. I don’t like that it occupies Video connector. Lots of systems only have a single one