Is it possiable to Scale Character to HMD Height?

I think this is a VR in general issue, if not please direct me to the appropriate forum.

I am using Vive and SteamVR in room mode.

I have added a character to a scene and linked it with SteamVR and VRIK (FinalIK) which all works fine.

The issue comes about when someone either smaller or larger than me tests my scene.

If smaller than me, then the character gets bent over, not standing straight up.

So my question is, how do other developers deal with different player height HMD and...

Is it possiable to Scale Character to HMD Height?