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Hi Stefan,
On my Skywatcher 200mm newt, the 1.25" eyepiece adaptor barrel unscrews, revealing a thread and this the screws onto the end of the EOS T ring, allowing me to achieve focus with my 1000D as the Tring and the remaining flange part of the 1.25" adaptor are very low profile.
Not sure if the Celestron has the same type 1.25" adaptor barrel arrangement, but worth a look.
Otherwise, the mirror MAY be able to be unscrewed from the bottom of the tube by loosening the retaining screws so the springs "push" it up the tube. Dont loosen them off till they pop out, but see if this helps too?
While my Skywatcher was collimated OK, the primary was screwed right down onto the bottom of the tube for transport and it took me a while to figure out why I couldnt get focus with the webcam in the focuser, until I thought about loosening the primary retaining screws a bit.
Give that a go as well.
Good luck.
Chris
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