You can route things over ssh like RDP for example. Used that a few times to remote in too a desktop at home. Can't install a VPN on most company and school devices. But ssh is build in to windows.
Can you elaborate why you think you need much more PCIe network cards? Technically you can do with 1 single LAN port with all your VLANs.
You configure the VLANs on the router then make a single trunk port to a switch. then have that switch divide the VLANs on the ports you desire. this can be a L2 switch.
I don't really agree with you here. If you take the time to set things up properly. And prepare for IF something would happen. Your fine. Been running a exposed jellyfin server for years now. Never hat a security issue. And even if I would, not much harm could be done anyway due to how it is setup.
How difficult can it be to just give someone a login? I don't get the whole sharing jellyfin is difficult argument. It is just as easy as any online service 🤷♂️
You can route things over ssh like RDP for example. Used that a few times to remote in too a desktop at home. Can't install a VPN on most company and school devices. But ssh is build in to windows.