Sadly the choices do not offer 2 props so Paul Anderson is the first pick.

Without a fourth prop, the monster who goes by his earthly name of Daniel Gartner needs to be on the bench for second row rotation and other nefarious reasons

Robbie Paul on the bench (why the F has not one of the game's best ever players not got a starting place)
On the bench as reserve/interchange Full Back, Centre, Wing, Stand Off, Scrum Half AND Hooker

4th sub is then difficult - forward or back?
Mike Forshaw for me

We now have a team that in no way on this earth, nor any earth you could imagine in space or time, could play happy families together off the field