honestly if you have a hard time sticking to two drinks at an event that could affect your livelihood, you probably just shouldn't drink.
we don't need some rube goldberg system of drink metering. we need people to handle their own shit. if they actually behave badly you can always fire them.
The goal is to help responsible adults remain responsible adults after a couple drinks when parts of your brain tell you to drink more than you know you should.
The default of two drinks per night is a good starting point; my point is to let responsible adults decide for themselves ahead of time if more than two would be good for them.