If you can figure out how to separate the SDS200's head unit to make it a remote head, you will make a fortune here.
I wouldn't remove the existing head, I would use Wi-Fi or a wired ethernet or USB connection between the remote device and the scanner, and use a combination of a touchscreen and physical knobs and buttons on the remote device to control the scanner and display what is being scanned. The remote unit would be somewhat like ProScan in that it would support being connected to multiple scanner models, but a dedicated device with physical knobs and buttons for functions common to all scanner models, and touchscreen control for model-specific stuff.
As a bonus, I would probably put a GPS receiver in the remote unit, so it can feed location data to unmodded scanners that support GPS input, and power models that are powered by USB jacks. All you would need is to plug the remote into a 5V or 12V power source, and then connect the remote and scanner with a single (model-specific) cable that would do power, GPS data, and control data.
