This is a big topic. We have done a lot of custom processing for various cameras over the years and basically just offer it for the custom systems we have sold. Taking pictures in different wave bands in the easy part. Stacking them and doing the appropriate processing takes a lot of work. Then there is making sure the calibration is done properly so the bands are evenly matched for reproducible data products. We have decided not to support the DJI Multispectral for various reasons but I am sure what you are looking to do is possible. Maybe ask DJI what they propose?