I’ve found with my own addictions that forcibly stopping one just causes a different one to start up.

The real solution for me has been healing trauma, resulting in baseline consciousness not being painful.

AA always gave off bad vibes to me because of the whole "surrender to a higher power" shtick

Absolutely. There has to be some little glimmer of already wanting to quit for them to take the help seriously. I would absolutely recommend AlAnon as well. You can't just force someone into treatment, and that's pretty much what interventions try to do, on top of making the person feel guilt and shame which likely is why they drink in the first place. Being able to have a one on one, calm conversation about how the person is affecting themselves and others is probably a good route, because people often do not recognize they have a problem in the first place. It would not be surprising for it to end with the person getting angry and storming out, but it plants the seed in a more reasonable way than having everyone they know cornering them, humiliating them, and saying "go to rehab now or we never speak to you again."

Source: in recovery, worked in the field.

Can 100% support Al-Anon. Great program.

+1 AlAnon is a good program. It shows how deeply ingrained alcohol is in our society that we have support programs just for people who know an alcoholic.