I would say Bopara is the best option because he provides a bowling option. The huge workload on Broad and Anderson will surely result in an injury and Bopara will be able to chip in with 10 overs or so and maybe a wicket. I know Trott bowls similarly to Bopara but he is significantly better and also plays spin quite well. If you want to play a new young player, play him at the start of a new series, not in a much which is a dead rubber.