The perfect bench would obviously be the 2 interchange props, but then a forward (second row/lock style) that can play hooker and an outside back that can cover 1-7. Mahoney plays 80 most weeks and you need cover for inevitable HIA's. If you go with Brown we end up not using him most weeks or he's playing a lock role which isn't optimal imo. It'll be fine (even tho not my pick) just better options in theory imo.
For the prop rotation, I'd start with King & TPJ, with Thompson & Sutton for interchange (maybe Pele at some stage depending on how things go).
Kikau picks himself on the left, but for the right, lock, & bench I would go RFM, Preston, & Topine (any combo - will probably change as the season goes on anyway).
And then Reynolds for 14.
I think that overall combo gives plenty of flexibility to deal with any curve balls thrown throughout the game.
Notable omissions. Davey & Waddell.