Reading Knuckles EV3 data with 1.x SDK

Hi,
We have created a pretty advanced abstraction and command mapping framework for our game. Alot that I right now can't see that the new SteamVR 2.x action and binding framework will solve for us.

Instead of rewriting the whole thing for SteamVR 2.x I wanted to investigate to create an abstraction like we have for Oculus touch and the Vive wands. I need to read the joystick data and I'm not sure how todo that with the old 1.x SDK since it only exposes the track button.