Your proposal seems to target the same issues as with multi-community support https://github.com/LemmyNet/lemmy/issues/818, which just got 6000€ funding from NLnet. Which seems to be a cleaner way of achieving the same goal.
Some suggested points are also against ActivityPub standard.
https://krebsonsecurity.com/2024/09/this-windows-powershell-phish-has-scary-potential/