I would keep the reciprocating saw blades, it was the triple redundancy I was thinking of. A kit this size is a "grams matter" kind of thing.

As for the wire saw, the reason why I was thinking it might not be worth the bulk is that many of them kink and snap VERY easily. Try this technique before you need it. Also, were you planning on standing under the branch while you sawed through it?

You can get small zipper bags from the hardware store or walmart- re-enforce them with duct or book tape, and they are great for storing things.

The reason I was asking about the mylar bag and the heatsheet is because they are both a little bit bulky- pulling one would give you space for a small first aid module.

Is the keychain your EDC? I thought it was, that is why I didn't comment on the micra.