It's honestly not that hard to remove the headliner and take the whole assembly out. I think I had mine out in an hour, with another set of hands at the end it would be even easier. Also, the edges are sharp... so wear gloves.
Totally worth doing though. It's not that hard, and you shouldn't have to break that seal then, or if you do, it's all apart and you can check it before putting it back up.