Thanks!
If you have Deviation installed on the Devo 10 you should be able to just connect it straight via USB, using the model file that is mentioned in the manual. (You might have to uninstall smartproplus for that to work)
The Spektrum should work with a mono audio cable and smartproplus. There are some videos and documents in the first post which might be of help.
I know several people including myself have successfully used a cheap old 4 channel Esky usb controller such as this
but I don't know if you can still get one of those. (The 6 channel HobbyKing variant is known to -not- work with Freerider).