Manbearcat
Legend
I don't know, frankly.
I'm having a hard time picturing it. That's not to say it's impossible, only that I can't think of a way to do this without messing with some pretty fundamental system mechanics.
-O
Narrativist play requires narrativist tools, just as simulationist play requires simulationist tools.
I think this is easily enough done and 4e already has functionality to this extent. The vast, vast majority of Martial Keyword powers are fundamentally Simulationist; causal logic is the driver and A > B requires little mental overhead. Its only issue is the temporal based resource schemes (martial encounter and daily powers).
You can have a simple core tactical module and use Keywords to cordone/silo the Simulationist Powers and the Narrative/Metagame Leveraging Powers away from one another. Easily enough done.
However. With the use of Keywords for clarity, expediency (and page count saving), the "these resource schemes look too 'gamey' and the books read like engineering manuals" complaints come out. Bridging that gap may require the use of purple prose in formatting the Simulationist powers (the simulationist version will probably need to be called maneuvers or tactics instead of powers so as to avoid the kewl powerz phonemenon) without the "immersion breaking, gamist jargon". The requirement of an abundance of purple prose may turn a large conveyance of "maneuver blocks" into a page-eating monster which will require the cutting away of essential material or upping the material cost to produce, and then sell, the books (and corresponding, uncomfortable meetings with the accounting dept).
Ok. Not easily enough done. I'm so glad I'm not on this project.