Re: How to avoid rehashing elements from the Nolan Trilogy
Eh, that's flooding a single movie with too many elements. Even if your rebooted setting does contain all of them, you'd want to cut away at least some of the ones that don't matter for the first movie's plot. Like, introduce the concept of multiple Robins, including the case with Jason Todd's outfit, but don't touch the Red Hood or go into too much detail about what Nightwing is up to. Then you can continue from there later on.