Not aware of any trick, but I would just try some wiggling here and there, go slowly, and when you feel like Hulk want to smash, stop and have a beer.
That cover is very pliable metal (aluminum?) and if you tweak it getting it off, it will probably be pretty easily retweaked into serviceable shape. On close inspection, the cover on my first VZ2008 was clearly damaged at some point, then reshaped prior to parkerization, with no detriment to function.
After you get it out, be sure that the striker spring guide rod isn't bent. That piece has some play built into it, so even if it's bent, it can probably also be reshaped.
Good luck. Take your time.