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Mardy,
There's a thread somewhere.....I explained how I used the derotator on my setup to successfully guide a spectroscope.
I'm sure what you are considering can be done... the derotator uses the site position and the RA/Dec of the object to calculate the required re-rotation speed. This is independent of the guide tracking control.
I only used it with an OAG and worked with the spectroscope slit on axis.
The deadband in the zenith killed my chances with the spectroscope!
Now I use the 12" Lx200 on a HHD wedge and cutdown HD tripod.
Hope this helps.
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