I’m not sure how useful this would be. SGP is an acquisition program and the display is just confirmation of things going to plan. Even with a debayer feature, in practice, however, I think only a few very bright nebula would show up effectively with a single sub. If I consider my PixInsight stacks of a CFA image, after hours of exposure they are normally heavily light polluted in my area or coloured by the LP filter. Stretching them just makes a mess and even after balancing, I have to boost the saturation greatly to achieve the result you have in mind.
For a pretty picture, it would require a simple calibration, live stacking (registration?) debayer and sympathetic stretching of all three channels to remove offending background colour. That to me sounds like something that runs as a separate app, monitoring the light folder and with access to calibration files. It would build up the image and update it with each light frame, letting SGP get on with its own business?