There is enough room to fit the reducer and adaptor inside the focuser assembly, though I'd only be left with about 0.5" travel (still enough to do the job). Can you give me a link to the SCT to 52mm adaptor?
The best solution would be a flattener that threads into the diagonal (focal ratio reduction isn't important) but the only one I've seen (TSSCKorr2)requires a precise distance to the eyepiece focal plane which is shorter than the light path length through a 2" diagonal.
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