Hm! I can't think of much to add, except.. the next thing I would've worked on might've been to integrate a client for https://patchwork.kernel.org/ to keep it in sync and mark patches there as handled.
I'm working on a replacement for patchwork. Here's an example of a thread which was rendered with my tool, which is just generated from organic mail threads without extra human intervention:
A Patchwork client (well, a tool that does some of the more useful patchwork status updating, it's not a full client as such) for notmuch, which has a number of kernel dev users: https://github.com/stewart-ibm/pwnm-sync
