Hey @pedrouid, thanks for answering but in this thread I‘m actually not looking for the same security guarantees that you do with the financial standards you mention.
Our keys aren‘t supposed to hold funds and their application privileges are always revocable onchain. They’re only used for upvoting, submitting links and commenting. So most of the design to keep financial keys safe actually ends up creating all these hurdles that I‘m describing. I‘m actually not going to blame them. We simply started using financial wallets for social apps! But this is why I‘m here explaining what I need 
I just wanted to clarify this right to begin with as to not make this thread move down the wrong path. Sorry if I may have been unclear!
These are keys for posting to social media protocols. They‘re only supposed to be used for publishing signed content. The custody wallet will continue to take care of funds and Kiwi News or Warpcast also still uses it, such that AA etc is still useful.
But we need a simple key exchange for the keys that just sign content, and this is what this thread is for.