Solution for FBT viewport staying high when sitting / driving?

[NjnaGrimsdottir]

Is there an active solution in IKTweaks for making the viewport (HMD View) move with the avatar when sitting in VRC?  For instance, nearly all driving / couches / chairs / mounts in VRC either leave your avatar in a standing position ON the seat, or seat your avatar's mesh, but leave the tracking points/hmd in the IRL physical positions.  Would it be possible to have the IK mod move the HMD position to the seated avatar positioning.   This in turn would push the rest of the trackers down in the world and let the hands / head be in the correct positioning for many of the games/sims in VRC.