So with a little research I found that control+shift+fn+power replaces the old control+shift+eject on keyboards without eject keys. However I find I have to hold the keys longer for it to work, probably due to the power button having a delay to prevent accidental sleeping/shutdown.
What I'm looking to do is throw caution to the wind and remove that delay so I can simply hit the key combo not hold it, as I'm more likely to lock my station if it's quick than if I have to do it with purpose.
For reasons related to what system hooks get fired I need to use this method of locking the screen, so other methods aren't what I'm looking for.
It looks like I'll be forking on the NoEjectDelay source to make a NoPowerDelay variation if nothing better comes along.