None of this is a big deal. There isn't a bridge in the world that hasn't provided for these routine inspections. Opponents of your design keep bringing up bird migrations. They thought it was a discovery that this was a migratory path. Name a river that isn't.
Birds use rivers.
That's the way they fly. You will notice in that poster of the bridge in Tampa that it's brightly lit and it looks gorgeous. If you built this bridge you'd WANT to light it. Sure, there's going to be a dumb bird that flies into a cable. I would not keep the plaza that is there now.