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From what I understand now regarding my fast refractor, it'd be unfair to put 9mm eyepieces into it. But I have this Maksutov-like camera lens here, with 500mm f/6.3 essentially a 79mm reflector without colour falseties. With a T2 15mm spacer and a very short diagonal the binoviewer should get into focus alright. Tested it with a 10mm eyepiece in a 30mm T2-1.25" holder and there was still room. (The 15mm spacer is necessary to clamp on a mounting bracket bc handheld is impossible due to the lens body IS the focuser ring.)
Maybe that weight plus bino is still okay for my nano.tracker, too, so binoviewing planet or moon on it could be relaxed fun.
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