Hb1hf Am I right in inferring, by the lack of priority tags, that it's not currently being worked on yet?
https://github.com/GrapheneOS/os-issue-tracker/issues/2197
From the outside it's hard to say, but I think it would not be easy, and I also suspect it would not be life-changing (as I recently posted).
Note that scoping IPC would not, by itself, shut down the "account" system.
Overall, it might be more productive to hammer down some of the glitches in the secondary-profile system than to try to add complicated fine-grained controls inside a profile -- especially if it's Google that fixes glitches in secondary profiles!
But this is all just my opinion. I briefly skimmed some of the developer docs on the user-profile system, but have not read any of the code.