Aw, thanks! Not everyone was so enthusiastic: https://news.ycombinator.com/item?id=29327905 and so far nobody has responded saying something like "what about the problem of fretting in the soda-lime due to thermocycling, won't that make it impermeable to gas?" or "why don't you just scrub the air directly with the lyewater?" or "actually chlor-alkali plants only get about 5% of that efficiency" so I think maybe HN was the wrong place for it.

HN is structured to reward gut reactions, quick dismissals, and claims of authority, not essays, "What if?" explorations, humility, and careful calculation.