You are in the same situation of needing a video processor unit, mostly found for use in video walls, another example, similiar to the datapath x4, http://www.digitalsignagelcd.com/video-processors-dido-jr.html
Again, wont be cheap.
There are some monitors around that have this image rotation ability built into them configured by an option in the monitors on screen menu.
I am not sure hacking the firmware is enough, you might be able to swap the width and hieght around, but you still need to rotate the pixels 90degrees.
Sadly it seems there is no easy/cheap solution.
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