Sounds interesting. Might be a bit tricky to do though, as the T-V Alliance lost, and it looked very BoE-ish from the movie.
Perhaps you could try doing something focussed on the edge of the battle, or on one particular part of it. Maybe crippling a Demon to stop it pursuing a friendly destroyer trying to outmaneuvre the Lucy, or covering the retreat as the GTD Legion - the Orion that gets gutted in the movie - goes down. Or defending transports evacuating the planet from Shivan bombers as the battle takes place in the distance.
Whatever you do, you'll have to find Nico/Venom's GTD Legion model to use, or make your own Orion mod with that hole in the hull as a destroyable subsystem so that the Lucifer can run it through...
Good luck