Newest version of Joycon-style stick posted (SCAD, STLs, and INO). Tested with the XBOX Adaptive Controller (XAC). Connects via USB port on side and acts as analog stick (either L or R, depending on what port you plug into). Files posted at: https://github.com/nelsonii/joycon
Working on a “stick of gum” style like Dmitry has done (https://github.com/…/tree/master/device_usbc_joystick). For those who need a lower profile, but can hold a longer device.
Big Thanks also go out to those who helped debug my connection problems (stick to board) — 90% of the problems were related to that part. Once I had solid connections, I had solid readings (no floating). The de-soldered USB board idea has been the best bet (barring custom PCBs). A custom PCB would save a lot of headache, but that is for another time.