Hi Dave,
I don't have 9.25" scope but I used to use almost the same combination(meade f6.3 reducer, Canon EOS, GSO Crayford 10:1 focuser) with my Celestron 8" SCT.
If 9.25" OTAs have the same visual back thread as 8" ones have it will be easy to connect.
You will need to remove a visual back adapter from your OTA and screw your reducer in the visual back of your OTA. Then simply screw your crayford focuser in the reducer and it's almost done. The only two things you will need are a T-Ring for 40D and a T-adapter.
I was using this one as a T-adapter with my Canons
https://www.bintelshop.com.au/Product.aspx?ID=7472
It has 2" thread to attach filters and you can use it with 1.25" eyepieces.
If you don't want it to use with 1.25 eyepieces this one would be better
https://www.bintelshop.com.au/Product.aspx?ID=7403
It has a wider diameter which means less vignetting.
They are both have M42 thread to add a T-Ring.
you can see it all connected on the first picture in my add at
http://www.iceinspace.com.au/forum/s...ad.php?t=33240
There is a QHY5 shown there instead of Canon. However QHY5s have the same female 42mm thread as a T-Ring for your Canon. Thus T-Ring is missing on the picture.
cheers,
Mike