Using 2 or more displays on a workstation without adding a GPU

[misterright1]

How can I use two or more displays on a workstation without adding a GPU , I've been thinking about testing if USB to HDMI/Display port adapters would work, I'm not sure but I think those register themselves as separate graphics cards. Or perhaps there's some virtual display trickery I can do.
I know Aster makes like a monitor that is duplicated so I don't know how well it would mix and work.

[misterright1]

Contacted support via e-mail, according to them the USB HDMI/VGA cards should work if they contain a Displaylink or Frescologic chip.