You can try to obfuscate the argument by waffling on about maid's aprons and moaning about pilots not knowing the limits in the different counties, but how complicated is
NO residual alcohol in the bloodstream when reporting for duty really??
- You are afraid of being framed by the media? Don't drink in public.
- You want to make sure you will never ever have a problem? Don't drink in the 24 hours before going to work
- You know you can't stop drinking once you start? Don't start drinking when you're nightstoppping.
- Can't function without that 'unwind' drink? Get help.
- You want to to drink socially with fellow crew because it is enjoyable? Do the simple maths involved, build in a safety margin, and you'll be fine. From the above example, 70kgs is 154 pound. Women beware, you metabolise at a slower pace.
All of the above is pretty straightforward and in one form or another practiced daily and
without problem by the vast majority of both cockpit and cabin crews all over the world.