@mark , if you want to completely remove any filtering and have full control over image processing, there is a way to request a full resolution 4056x3040 10-bit image from IMX412. We have tools to convert the 10-bit bayer image to mono and RGB (computations done on CPU, so they are slow).
I just tested this out and it works. I needed to make small change in camera server to convert from 10 bit to 8 bit image correctly. By the way, also if you really wanted, you could convert 10 bit to 16bit image and use make use of higher bit width for more detail.
If you are interested in trying out the direct RAW10 -> RGB approach, please let me know, i can provide instructions. I used voxl-portal to view the mono and RBG images that were converted from RAW10 to RAW8 and then debayered on CPU.
Regarding the ISP processing tuning knobs, yes it will take some time, I don't have an ETA yet .
Alex