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The variable spacer is just a spacer with a normal female M42 thread and a long male thread with a lock ring. It might get you the desired spacing to test but I doubt it will be reliably square enough to use long term with how tiny the focus zone is at F2.
What I would do would be to use that to work out your correct spacing (While accepting that tilt issues are likely) then carefully measure the total spacer distance between the RASA M42 adapter face and camera face and get on to the Likes of Josh Bunn on here to get a through threaded M42 adapter made to the exact length (Or maybe 1mm or so less) that you need. Slightly less to allow you to use some delrin washers to pack it out perfectly and make it easier to remove things later.
I am interested to see how you go given I have an ASI294 and have looked at the RASA 8 since it was released.
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