Rendering VR controllers for both desktop + mobile?

I am trying to upgrade a Desktop VR project to be a crossplatform project; this involves getting rid of SteamVR. I not only want to support desktop machines, but also iPads (no controllers, all custom interaction code) and maybe the Oculus Quest.

However, SteamVR has some really nice features I'm losing.

Is there some existing Unity code or package that helps with rendering the correct models for controllers, or do I need to buy/find models for all of the controllers I want and manually set them up?

Thank you

 

The latter, I imagine. (Or, since you already own SteamVR, perhaps you can yoink the models out of that?)