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Robin Cassady makes a tandem bar and a saddle with adjustments on one so you can do that.
I may still have a Cassady tandem bar (not sure) if you are interested.
Considering how much time it takes to frame an object just right I wonder how good that would be. Perhaps a better setup and one I have seen used a lot is where a widerfield scope is used for colour which is less demanding for detail and a longer focal length for luminance and detail. Aligning them then with no waste of FOV is easier.
If your two scopes weren't accurately aligned you would lose FOV of your camera which could degrade the final image.
In fact this what I was planning to do with my 2 setups. The TEC180 for colour and the CDK for detail. As you say getting double the exposure time is valuable given weather vagaries.
Greg.
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