Hi there,
Xbox 360 controllers work well as a wireless pendant (you can go wired if you prefer), all you need is a wireless receiver which are dirt cheap.
I picked up a receiver from ebay for $11 and works a treat. AU PC USB Wireless Gaming Receiver Adapter FOR Xbox 360 Controller Black | eBay
both analog sticks will operate the axis you require.
I used the pcb from an 360 controller to make my own custom pendant along with the analog sticks.
Still a work in progress (need to add status leds and change a few things) but it is functional and works well.