is that 4/8 way switch set up a copy of some existing design or your own work? damn fine idea either way 
The switch mech shown in the photo is very similar to RandyT's Omnistick Prodigy switch for Suzo sticks. I had a few Suzos sitting around so I thought I'd try it out, I'm not going to give any details of that switch so as not to step on anyones toes.
The switch that I'm still working on (having trouble finding time these days) is original and if all goes acording to plan it'll be the cheapest 4/8way switcheable stick out there, its going to need a lot of CNC trial and error though.
It should be easy to install on most CP's too- you just need to drill one 1/8" hole above the joystick. When I'm done I'll see about doing a small production run on them, but time isn't on my side anymore; my wedding is only a month away (

)