This is just off the top of my head, but presumably your parents are older people with set ways. Buying them a bunch of stuff that they've never seen before just means when they need it, they won't think to use it.
The best thing you can add to your list is sitting down with them for a half-hour to an hour, and going over the kit, talking about when they might need it, letting them put their hands on, and getting feedback from them. OK, so it won't be a surprise, but it will be more useful for them.
It's a bit pricey, but I recommend throwing in a JetBoil for a stove, if you walk them through using it first. Dead easy to use and they might find themselves using it in non-emergency situations too.