It does seem like camera manufacturers would care more about tilt rather than orthogonality. In my older square QHY8 the sensor is attached to a metal plate that is then screwed to the heat sink, allowing for some correction of tilt. I was able to greatly improve it using just a dial test indicator. If your camera uses a similar setup it seems plausible that it could shift in the x and y as well. Maybe there is some room for adjustment?
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