@cwebber I would really like to read such an analysis, FWIW.
Concerning the efforts to since the technical challenges, I recently found out that there's also an ongoing effort to merge some of Zot's feature into AP (https://wedistribute.org/2024/03/activitypub-nomadic-identity/) and it's interesting to see how different this is from your approach.
Ultimately my hope is that BS looming will help prioritize these challenges, in whichever way they get solved.