Hi! I think all those scenarios are great.
I headcanon that Cassian internally struggles with the risks that Jyn takes. He completely understands why she takes them, how inherent it is to her, but it still causes him a lot of sleepless nights. To your point, he worries that it’s one risk to many and she won’t come home; he worries that she will risk everything for him and then he’ll be faced with the endless void of her absence; he worries that if he tamps down that reckless side of her he change who she is fundamentally and that isn’t what he wants. Lol, I could go on!
I love where you are headed! It’s so good!