Hi Lewis,
Send Dave a email.
Ask Dave if he could look into making a kit up for you link below.
http://rowanastronomy.com/
send this link below so he know what you Want.
http://www.teleskop-express.de/shop/...15_Skywatcher-SynScan-GoTo-Upgrade-
Kit-fuer-EQ5-und-aehnliche.html