Calibrate (bias, darks, flats as required)
BatchDebayer script
StarAlignment
ImageIntegration
The BatchPreprocessing script will do the job if you don't want to use separate processes at first.
You don't need to split in to separate RGB images for OSC images usually. The FITS images after debayering have three planes for each image. The main difference from mono is that you only have one set of calibration frames, especially flats, which are applied before debayering.
Once you have the basic process sorted, look at the various drizzling options. They make a real difference to the end result if you have sufficient dithered sub's.