I think Lemanis will go with a pretty experienced starting lineup that will definitely include Bogut, Dellavedova and Ingles and probably Broekhoff for the balance his shooting, defence and rebounding brings.
Baynes might start at the 4, but personally I hope that doesn't happen as it will make us too slow and he and Bogut will get in each other's way in the paint.
If Simmons commits to the Olympics early and can spend enough practice time with the team, then maybe he could start, but I just don't see Lemanis being ready to build this team around him yet. Hopefully that will happen leading into the next World Champs though.
So I think the 4 should be either Motum or Andersen, because their shooting will open up the floor for Bogut, Simmons, Newley and Ingles to score at the rim.
Mills, Simmons and Baynes to be the others to see significant minutes.
The remaining slots probably don't matter a lot unless there is an injury, but I would take Newley as an athletic spark-plug. Lisch is having a stunning shooting year and is a solid ball-handler, so I think he'd be worth considering if he has naturalised by then. If not, either Goulding or Blanchfield would be ok, though both are only shooting 35% and 34% respectively from 3.
That's still only eleven, but I just don't think the 12th guy will play. For that reason, I'd keep Exum around for the experience (if he makes himself available). If not, maybe Ogilvy or Jawai sneaks in, but I can't see them having much impact.
To sum up:
Bogut Baynes Andersen
Delly Mills Exum