Your dithering woes would frustrate me. You can still dither with two separate cameras. One imaging, the other guiding. The only complexity is to work out the dithering shift between guider pixels and imaging sensor pixels (usually based on arcsec/pixel). I know MaximDL can achieve this so I'm sure other data acquisition software can. Maybe worth investigating, but if you're happy with what you've got, stick with it.
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