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I don't think the problem will be the guiding off sets ( AA4 and other programs can guide on comets...maybe even PHD if the hourly motion is not too much)
The problem will be getting a bright enough image to guide ON.
As you say the guide scope may not be enough - I think you are considering objects around the 14-16 mag???
The split mirror idea (modified Vixen with a 80/20 split) costs about 0.5 mag to the spectrum and up to 2mags on the guide image so if you can see and guide on stars 2 mag fainter than the target object it could offer a solution. Otherwise an off axis guider with "off-set" guiding would be the way to go.
Ken
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