I surmise that the first two paragraphs are in jest, and I applaud you for it, but unless they're not, or someone else does not realize it:

How do you instruct LLM 3 (and 2) to do this? Is it the same interface for control as for data? I think we can all see where this is going.

If the solution then is to create even more abstractions to safely handle data flow, then I too arrive at your final paragraph.