@atomicpoet I'm not sure "resource-demanding" means it can't run on a Raspberry Pi.
Nor does it sound necessary from the descriptions.
This all sounds like Google AMP .sxg for posts and BGS's are just relay servers (like Google is for AMP .sxg).
My only worry is how a private page would work, but nobody seems to really have this sorted out (except for maybe SSB and that comes with large tradeoffs).