Is it possible to have 2 Internet channels for 1 network?

Question

Network administration

There is a home local network passing through a Zyxel Giga 2 router that distributes the Internet to other computers, to which a switch is additionally connected , dividing the network into other equipment, and to which a server is connected. The server has only 1 gigabit network card, without the possibility of installing an additional one, due to the lack of pci slots in the motherboard.
Now it is possible to connect an additional Internet source from Dom.Ru, the use of which is planned only on the server, but with the ability to access the local network connected to the router, is it possible to connect wires from Dom.Ru to the additional port of the WAN switch, which includes a wire with the existing Internet distributed router, but configure the server in such a way that the Internet rises only to them.
I am attaching a diagram of the existing local network.

Answer 1

It's elementary if the switch can VLAN. Otherwise no.

Answer 2

due to the lack of pci slots in the motherboard

No PCI-e either?
If I'm not confused, in Zyxel Giga 2 you can configure the LAN port as another WAN, and do what you need.

Answer 3

You can play like this if the server's network card understands VLANs, you just have to run comp2 (or comp1) through the switch
ZY . VLAN0 is a regular LAN, so other computers will see the server