What? The CGX comes with a long 12V cig lighter type plug on one end and the standard screw in 12v screw on plug end on the scope side. Simplist solution for you is to just buy a Bintel AC to 12V adaptor, which outputs about 7amps, at the Cig plug receptacle. I have been using one for four years with my CGX, no problems.
https://www.bintel.com.au/product/po...v=322b26af01d5
Your going to need to use the standard supplied CGX power cable if you ever take it out to the field anyway, so why not use it all the time with a standard cig adaptor when you want to AC power the mount?
BTW my CGX manual specifically states that the mount requires a supply that provides at least 12V 4amps, and that a 12V 5amp power supply is available from Celestron which includes the threaded barrel connector. The mount will draw what it needs, so a higher amp rated supply is fine to use.
You cannot have looked too hard:
https://www.celestron.com/products/ac-adapter-5-amp