How to turn on a MacBookPro (with HASS OS installed) via wake on LAN?

I installed HASS OS on MBP 2010. it works great headless!
now, i want to make the laptop physically smaller. all i need to have HA running is just the motherboard. dont need anything like keyboard, trackpad, battery, super drive, etc… after ripping the MBP down to its bare essential, i realize i cannot turn it on without the keyboard attached! yikes. the power button is a button on the kb!
if for whatever reason my HA dies, i can just pull the power cord to turn it off, but no idea how to turn it back on if i dont have its kb attached. what are my options?

i dont see WOL anywhere but i only saw this shorting and verified it working well! Turning on MacBook Pro without power button – Inside my laptop