How would that work?
a ring type device on the side with a flexible straw down to the mouth??
or am I deliberately mis-understanding?
and - inevitably - they are already available
https://www.ebay.co.uk/itm/295243663850?var=0&toolid=10044&customid=082981faa7a9197499f0e65b7eedc287
Whilst I wasn't 100% being serious, it was still a somewhat serious, if facetious point.
Alcohol consumption is strongly associated with head injury, and indeed, injuries generally. (no citations but not really in dispute). A recent paper discussed upthread (supposedly) made a case for cycle helmets by noting (from memory) a correlation between head injury rates and lack of cycle helmets, then rather glibly mentioned, but failed to properly consider, the correlation between alcohol consumption and not wearing a helmet. Given the obvious linkage between drinking and falling off bikes, or indeed falling in general, they did seem to be targeting the wrong issue.
At the risk of being maudlin an old friend was drinking quite a lot and one day fell and knocked his head at home and sadly died of a brain bleed.
Of course, we'd all instinctively ridicule a proposal for "pub helmets", or even "drinking-at-home helmets", but if we were rational and objective it would likely be a more compelling case than for cycle helmets.
This isn't per se a reason not to wear a cycle helmet, IF it had a benefit on balance, but does somewhat take the wind out of the sails of any argument for compulsion.
For me, I'd need to be persuaded that
1) Cycle helmets on balance are beneficial
(this hasn't really be demonstrated by research that doesn't unravel when looked at closely)
2) Any risk reduction is significantly greater than for comparable scenarios where you really wouldn't bother with a helmet. (OK a vague notion but let's say pedestrian helmets, stairs helmets, pub helmets)
A comparison for point 2 might be the wisdom of safety goggles for using a grinder, or riding a motorcycle, but not bothering for cooking in the kitchen or using a power drill (at home)
For the record I was an early adopter of a cycle helmet in about 1980 but having read up on it no longer wear one, so was an early ditcher of helmets too.