SteamVR + Vive: Scaling the camera rig around the player

Hi there

I'm playing with player scale by scaling the camera rig's scale, but there's a limitation to this in that the scaling happens rooted to the anchor point.

I wanted to try and work out a way to scale around the player's feet, or at least, based on the headset position, but it doesn't seem possible to move the anchor point, if I moved the camera rig within another gameobject, the player moves, and I can't manually move the player's head tracking...

Is there a way to do this?