to my understanding of eqmod, you can do away with all the gpusb and all the other crud.
i use the wireless logitech rumble pad, and it works a absolute treat. almost a plug and play event. using PHD i can route guide movements back though the serial cable. if it can move the mount normally, it should be able to control it for guiding.
currently i use the serial to usb connection 35 bucks from a local computer shop
mount --> hand controller ---> rj12/serial cable (supplied)---> serial -->usb--->PC.
i can get rid of the hand controller compleately if i wish but i leave it on so i can jump out into hand controller mode for those nights where things just don't work