Combining parts of original Android with newer sources to create a new image

Hi I wanted to talk to the pros on the compiling and decompiling Android source and binaries respectively. Is it possible to decompile an Android OS running in a device and get its source, so that you can extract useful things such as device drivers that you can also use later to compile another binary (image) that can be installed on the same device but with the edited source.

For example I have a Samsung AAAA with android 2.3.3 and it's working fine and I want it to have android 4.0.4 ... can I decompile the image it has now (2.3.3) to source (2.3.3) then take the drivers or some other source element join it with a segment of the source of 4.0.4 to make a new image (binary with some drivers from 2.3.3 and some source from 4.0.4) then use this image flash it into the device Samsung AAAA.

Is it possible help much appreciated.