Stu,
The plan is good and can certainly be done. But, there are numerous pitfalls and traps. Seriously, you might be better off getting a 2nd mount because that solves the following:
1. Differential flexure
2. Simultaneous exposures
3. Guiding/Dithering
4. Software to run two cameras
5. Focusing two scopes simultaneously
I'm sure I've neglected a few things. With a second mount you can deal with all these issues because they basically don't exist!
Good luck!
Peter
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