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Hi Rob,
As no-one else more knowledgeable has responded yet I thought I'd jump in and ask the obvious question - have you considered going for an off-axis guider?
Imaging through an RC at a focal length of 2000mm might not be well suited to guiding through a guidescope given the risk of differential flexure (no matter what guidescope you choose). Some people make a guidescope work when imaging at long focal lengths but most with setups similar to yours would go the OAG option I believe
It might difficult to know whether the guidescope option will work or not till you try it. Perhaps a small ED/Apo refractor that could also be put to use as a wide-field imaging scope &/or grab & go visual scope might be an option in case the guidescope path doesn't give satisfactory results?
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