Ditto to everything John has said. Plus a couple of other things to think about as well as the wedge.
1. to connect the camera t ring to the visual back of the SCT you will need a T thread adapter as the SCT doesn't have a T thread
2. Do you have the meade Zeroshift microfocuser with your GPS? If not consider getting one. It makes focusing much much easier
3 get a piggy back bracket
and a freely rotating head like
this for some wide field work.
As John has said at 2500 mm focal length you are going to get field rotation fairly quickly. If you go piggyback for a while with only short focal lengths (50 - 100mm for example) you may be able to get up to a minute without rotation not using a wedge. It also depends on where you are aiming in the sky as well as the focal length.