I haven't delved into that too much and I'm winding down for the night, but off the top of my head, marijuana typically shows good effect for some anxiety users (although not for all). Since benzodiazepines are typically prescribed to anxious people, I'd assume that yes, marijuana would be a viable option to try in states/countries where it's legally accessible.

That being said, marijuana has other effects that can make life challenging to navigate (obviously), and someone might need too high a dose of marijuana to effectively calm their anxiety for it to be a manageable long-term solution. My personal theory is that anxiety makes it too hard to hold a train of thought for anxiety to easily be justified by rumination, but being unable to hold a train of thought would be challenging in most occupations (except perhaps politics... badum-tiss).

I could see a surface-level justification for using small amounts of alcohol to combat benzo withdrawal, but I can't find much research on it, and while they are chemically similar, don't necessarily have the same kinetics or other such chemical factors that would make them a ready substitution.

Especially since, from a psychological point of view, you need to consider that someone who was prescribed benzodiazepines might actually have a valid anxiety issue that still needs sedation. Benzo withdrawal causes anxiety, and if even microdosing alcohol causes a calming relief, then there's a high risk that it'll pair as a classically-condition association.

"Now instead of benzos calming me down, I associate the taste of alcohol with calming down." And for an anxious person already vulnerable to dependence on sedatives, that's a bigger risk than I'd probably wager.