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The existing solution works ! - you have a rotator that is positioned in front of the OAG/guide camera and the main camera and with ASCOM and the appropriate image acquisition software, after a meridian flip the software automatically rotates the whole system 180 degrees for you.
This way you keep using the same guidestar and there is no change in position.
SBIG cameras have a fixed position internal guide chip and its rare not to be able to get a good guide star, so the same should apply to any setup if the mount is stable and accurate then you simply keep exposing for longer to improve the SNR of the guide image
Usually >20 SNR is what you want, but on a Paramount for example you can still use a guide star around 10 SNR.
Having a chilled guide camera with a shutter so you can take darks and have them applied automatically during the guiding process is also something that really helps improve the SNR.
Rally
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