Bottom bracket/plate unlikely to have bent - it's steel whereas the top bracket is aluminium.
The way i straightened mine ....
Lay it flat on a piece of card, on a surface with the feet overhanging the edge, then draw round it. Turn it over and do the same again, then draw a new position to show where it should be! It's fairly easy to bend but ideal to clamp lightly in a vice. Get it to match the new drawing, then ..... offer it up to both the screen and bike mounting points independently to determine whether you've got the shape and the foot spacing correct.
Stu.