In my case I was able to cut the spacing down a lot between the corrector and the sensor. First up was exactly what you mentioned, I realised a diagonal I had could be scavenged to give me an SCT thread and a much shorter adapter length. Then I was able to cut the spacing between my guider and imaging cam a bit. At this point the guide cam is only just acceptably in focus with the focuser for that part racked in as far as possible.
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