Yes. You need to use radiation, via radiators. It’s a shame I’m getting downvoted on this, because I really do know what I’m talking about on this one. Ammonia in heat pipes wicks the heat away from the thing you want to be cold, towards the radiator, which is usually just a dumb coil, but could be enhanced with a bimetallic thermally decoupled louver if you want to keep it cool in sunlight. Or bury it, since we’re on the moon. From an engineering perspective it’s not that difficult to do, as the variables which affect it are well known and don’t change that much. It is for sure slower than combined conductive/convective cooling, but it’s a known quantity, so you can plan quite effectively.
Fair play to you for posting that many comments. You’re putting the actual work in to make this place interesting. The best thing about you in my opinion, as opposed to a lot of active posters (here and elsewhere) is that you often disagree with the hive mind, and you stick to your guns. And I’ve seen you, on more than one occasion, actually, publicly change your fucking mind when you were presented with a persuasive argument. Lemmy, the Fediverse, and internet discussion in general, needs more like you. (Even if you were wrong about that one thing that time).
To your health, Mr. Squid!