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I think Andrew has given the answer.
The new configuration for the focal reducer will not focus far enough from the reducer even with the SCT mirror right forward to allow even a direct attachment of an eyepiece to reach focus let alone a rightangle adaptor. Particularly if you have a moonlight focuser or similar between the back of the telescope and the reducer.
You may just do it with only the reducer and the rightangle lens holder and use the mirror shift for all focusing.
Barry
PS I looked up my old table for focus positions using my counter mod. and even with the original long FL reducer barelly made it with a 26mm ocular in a diagonal holder.
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