Been looking into the same thing here in Wisconsin for AH sister. Not too many options available. We have the option to submit a 3 Person Petition, where 3 people write a letter stating why the person needs help, but according to the official I talked to, it doesn't usually occur with alcoholics, just people with mental disease.
You know, despite my efforts to try this, it still comes down to the AH wanting to quit. You could have them go to an IP facility for 28 day clean up, but as soon as they get out, back to same old stuff.
I keep telling myself that when my sister comes out and asks for help and knows she has is an alcoholic, that will be the time she gets help, nothing I or my Mom do to force the issue will help her, she needs to help herself.