Is there a way to use a single bitmapdata for multiple images with GPU mode?

With GPU mode is there a way to bring in a single 1024 X 1024 png containing all my sprites and then slice it up into multiple display objects all refering to the original BitmapData?
I have an app that runs in GPU mode - but I want to optimize the image management.
I am making three sets of images in the orders of 2048, 1024 and 512 px.
The app is a book app and each page has around 4 to 5 bitmaps. I would like to bring in one single image and slice it up - but just refer to the original bitMapData in the memory.
Is there a way to do this - e.g. using a masking technique?
I think it is possible using textures in direct mode - but that is not an ideal solution for me - as the app is already in the appstore - and I would have to entirely refactor it for stage3D. Also I use very large bitmaps which have some masking animations applied to them dynamically: http://youtu.be/Nm0T1jLCTz8?t=42s
Currently, I use jpgs and a jpeg mask file for each image which I composite to get the alpha - then I scale them.
PNGs may be better for GPU - (no compositing) but they make for a huge app file.
Now I am converting it to use diffent sized assets depending on the device, then scaling them if need, and then compositing them for apha.  What I was hoping was to find a technique that could reduce the number of bitmapdata objects used and reduce the operations in general. 
Any thoughts on optimizing would be appreciated.  I can add my code here if it helps.

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