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For the C925, you can use Baader 2" ClickLock SCL (3.3") clamp (C9¼" - C14") #2956233
https://www.baader-planetarium.com/en/accessories/adapters-imaging-accessories/eyepiece-clamps/baader-2%22-clicklock-eyepiece-clamps.html#574=931
to use any camera with a 2" nosepiece. It has got a length of 40mm. The ideal backfocus of a Schmidt-Cassegrain is about 5" (a little bit omre for the C925, see https://www.celestron.com/blogs/knowledgebase/what-are-the-optimum-back-focus-distances-for-celestron-scts
So, to use it the perfect distance, you may want to get closer to this with an extension like Baader 2" ClickLock 47 mm extension #2956247 or some other extension tubes. But you'll reach focus without the extension, too.

Celestron provides a T-adapter to SC which gives you the right distance, but it uses only the T-thread (M42x0.75) and will cause vignetting on a full-frame sensor (and is also calculated for a DSLR with 55mm flange distance.

When using the Safety Herschel Wedge, no additional front aperture filter is needed.
Please also read the instructions for the Herschel Wedge thoroughly and only use this product if you feel well informed about the consequenzes of wrong handling.

Yes, no problem - all standard 2" accessories fit into the 2" ClickLock, and all 1.25" accessorieries fit into the 2"/1.25" reducer.

Please take a look at this PDF, where we describe the different camera adaptations:
https://www.baader-planetarium.com/en/downloads/dl/file/id/444/product/2846/digiscoping_camera_adaptations_for_afocal_photography_and_eyepiece_projection.pdf

There you will also find the formula which gives you the effective focal length which you reach with this method. It depends on the distance between eyepiece and sensor. Also, with a larger sensor like a DSLR, you need a larger distance, otherwise there will be distortions at the field of view. Also, the desired f/ratio depends on the pixel size of your camera; it shouldn't be slower than f/30; cameras with very small pixel even work best at f/10, otherwise the pixel size and the resolution of your camera don't match.

So, you should determine the desired effective focal length and match the T-2-extensions to it. With a long-focal-length telescope like a Schmidt-Cassegrain, you'll probably prefer the Hyperion zoom over the Morpheus because of the resulting focal length.

Both Morpheus and the recent Hyperion eyepieces require the M43/T-2-adapter #2958080.

You can use both 1.25" clamps. The Clicklock gives a firmer grip, while you can better finetune the distance with the cheaper clamp - and it is especially interesting for focusing, so that you can avoid any mirror shift by telescopes like a Schmidt-Cassegrain.

The focal length is 63mm.