Request: ASUS P7P55D EVO BIOS Mod for Headless Start (No GPU)

Would it be possible to mod the bios so that the system would start headless (without a GPU/GFX Card attached)?
Currently it hangs at post when it doesn’t recognize a gfx-card, since it’s a “consumer” motherboard.

Board is an ASUS P7P55D EVO and has a Legacy BIOS (No UEFI present).

I’m new to this and before i dig deeper into this topic i’d like to ask if it’s possible at all.

Hopefully this is the right place to ask,
Regards