thanks for the info
1) looks like the raw hooks only process pixels at a time, it is unfortunate that we are unable to access the digic processor
2) yes i have some sort of filter to let in only UV, my main issue is the image processing itself however. the camera still has the IR filter in so the UV insensitivity + the IR filter works out quite closely. i just need to use really long shutter speeds but i am shooting still objects so this is not a problem.
if anyone has some genius way to do the combination (without pixel by pixel manipulation) on camera this would be great as my project prevents me from accessing a computer for long periods of time and a preview of the results would be great.