If you feel the need to do this, I'd use a tincture that would normally be intended to add to a drink. That would be way easier than trying to figure out gummies. This way you could add it at packaging. Of course, at that point, you might as well just dose it in the glass as you pour it so you can control your dose. Depending on how much you drink and your typical dose of edibles, 1-2mg per pint would be the highest I'd go. And I'd be sure to warn the hell out of anyone you share the beer with!
Oral THC doesn't kick in anywhere near as fast as alcohol, so you're setting yourself up for a double whammy after you've been drinking for a while and then the accumulated THC starts to kick in... and keeps kicking in long after the point when you wish you stopped drinking hours prior...