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Depending on how easy it is to remove the focuser on any of them all you'd need is an OTA to PDF adapter. Unscrew the focuser and screw on the PDF. This would give your the most rigid imaging train.
Although you could just attach it to the end of the draw tube but then you increase the amount of weight/torque on the draw tube. This is what I did with my refractor when I was using an ASI1600 but thinking back now, I think that is what was causing some of the tilt that I struggled to remove.
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