Sure. The SCT would make a fine guide scope for piggy back with SLR. If you would want to do prime focus you should use a focal reducer with an off axis guider to ensure mirror flop doesn't ruin a long exposure. But, off axis guider can be difficult and tedious to acquire guide stars with manual eyepiece guiding. There is no guarantee there will be a bright enough guide star where you need one. Autoguiding is preferred. That's a lot of focal length and you would need to see your skies are steady enough to image at that higher focal length. In my neck of the woods the atmospheric conditions won't allow it. You can determine this by doing some practice guiding with an illuminated guiding eyepiece.
My off axis guiders are older models no longer made so, I'm not exactly sure what would work today. See if you could mate Celestron's current OAG with their generic .63 reducer.
The .63 reducer works with their old Radial Guider if you can find a used one.
SCT Universal Piggyback Mount for SLR