Tandem Workflow in Photoshop

I guess I need to spell things out in detail for the Adobe crowd. In Photoshop ACR, the tandem Raw profile workflow could be implemented with the DNG matrix transformations as the faithful calibration profile, and something akin to a "Raw adjustment layer" as the digital emulsion.

The essential feature is that the effect of both the camera calibration and the emulsion be previewed when the user twiddles the Raw sliders eg. exposure.

Edmund