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In order to enable the back panel graphics connectors you must install a processor with on-board graphics. Since the motherboard does not have a graphics controller built in, the serial port header will not accomplish with the task you are looking for.
Yeah. Maybe I wasn't clear. I was willing to let go on the backpanel HDMI connector and fallback on text-mode graphics only on serial port. I think the serial port would be enabled out-of-the-box, but I realized that the computer would probably not even pass the POST-check at boot, for lack of a graphics adapter or frame buffer. So, you NEED a graphics adapter to boot, even if you don't plan on using it.
I've looked at cheap options for graphics, e.g. simple VGA adapters on pci-e x1, but couldn't find anything good under 60$ (card + pci-e riser + time needed to carve out the back plate). Not worth it for my use case. I wish there existed a dummy-video-adapter you could just plug in, just to pass POST.