Here's a suggestion.
The current limitation with the 2600MM DUO is that narrow band filters severely limit the light reaching the guide sensor. This could be overcome if the red circular faceplate of the 2600 was remodeled to include a slider carrying rectangular filters that fit in front of the main sensor only; the whole set loaded from the side like a card. This would leave the guide sensor unobstructed.
It also suggests the motor and electronics to select filters would also be integrated with the camera.
