I think you are right that HN is not the right venue. A lot of what has kept it functional for over a decade is the focus on tech. It's not followed to the letter, but an attempt to make HN into SSC would probably destroy it. It's valuable enough as it is, so let's not take the chance.
The bright part is that (so far as I can tell) if one could attract the core community, SSC should be fairly portable. Scott's top posts were sometimes really good, but I don't think they were essential. I'm tempted that the right approach may be just to create a new space, advertise it, and try to attract enough of the core community to jump start it.
I picture it to be like capturing a swarm of bees: put a large cardboard box under the tree limb that they are hanging from, give it a sharp shake, seal up the box, take it to a new location, and install in a new hive. If you managed to capture a viable queen in the transfer, you are done! If not, you need to get the swarm to accept a new queen, with a process that involves exposure to the new queen's pheremones (and sometimes marshmallows --- I'm a little fuzzy on the details).
If one was to take that approach (metaphorically) where would you begin? And technologically, is there some better tool for the job than a Wordpress blog?