On the other hand it may gain in practicality should we suddenly find ourselves eking out a subsistence-level existence as desert nomads following a major nuclear exchange.

You might enjoy, if you haven't already encountered it, some of the writing of the Marxist novelist and philosopher China Mieville. An interesting thinker of this intersection. www.patreon.com/posts/24723065 www.bostonreview.net/articles/lit... salvage.zone/beyond-folk-...

IMO it makes more sense to have organized group/tendency within a larger secular group (lets be honest DSA). I don't know if it would need to be a caucus per se as while I think faith transforms politics I don't think it is a politics as such. Also I am probably further left than most.

What is a good source?

destroying the legitimacy of the regime is a real and valuable strategic outcome

the midwest needs its own parties