Hello !
From few weeks, I think about a new way to create off-chain execution (looks like oracles).
I wrote a diagram about it, I am sure that many things can be better but this model can allow many new things.
If some guys are interested about it, please give me your feedbacks 
Here is the notion about it : Notion – The all-in-one workspace for your notes, tasks, wikis, and databases.
Have a good day !