Adding an additional 3dof controller to WMR kit. Anyone else try / test this yet?

Issue i am having is the the 3 dof controller needs to be velcro'd to the bottom of the chair which is out of view. When i try this with the regular 6dof WMR controllers i have to look at it (lft controller) before it will start tracking in 3dof or 6dof. I plan on getting a used Samsung or Google daydream 3dof controller to test if i can add this to the input list and just velcro that controller to the bottom of the chair since automatically updates and displays the orientation when project is started without having to look at it.

 

I have confirmed this works (5.6) a little problematic with new 2018 Unity.