How to support Daydream View remote on iOS?

I've been working with Cardboard VR on iOS, and that's been great. But I'm looking somewhat longingly at the Daydream View, and its remote. This Reddit thread claims that the remote can be accessed on iPhone via Bluetooth, but app support for this is rare/unknown.

Can we support the View remote on iOS in Unity? How would we go about it?

For starters, I'd be satisfied just to get a click. If we could get motion data, so much the better.

(I won't even ask — yet — about accessing the headset's head-tracking... let's start simple!)