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Great idea Lee; however, it would require the pick off prism to be at a relatively large distance from the optical axis, so it would not obstruct main camera's CCD at some angles. Few manufacturers of excellent Astro cameras permanently secure the pick off prism as close as possible to the optical axis and the main camera's CCD for good reasons.
I think an alternative solution (probably also cheaper and simpler than motorised solution) would be getting a very sensitive guide camera so you would always have an adequate guide star available.
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