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My Tpoint runs have a lowest elevation of 45 degrees. Going lower can give inconsistent results. So I think 45 degrees is the lowest you should go. Others may disagree.
With the camera, am I to understand that this camera has a SLR lens adapter permanently on it? If so this is going to be the source of the flexure. Screw mounting is the only way to go, SLR mounts always have some movement and it does not need to be much. Can the camera be used without this mount?
The usual way to go about things with reducers and flatteners is to have the field corrector after the focusor and then have a custom made adaptor between the field corrector and the camera / filter wheel. Precision parts makes these adapters.
Would you consider another camera? That might help your situation.
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