With a three pound limit, you can put together a decently comprehensive kit, somewaht broader in scope than what you have now. Really pay attention to ounces - I would look long and hard at the need for two knives (I do not buy into the "two is one, and one is none" philosophy), and you can get lighter knives of comparable utility than what you have now.

Consider one or two very light freeze dried meals to go along with your snacks. You should have no problem getting water.

I am curious, does your office or any one else track your flights? We did this in the Channel Islands with every flight - it really paid off when a helo had to set down on the ocean one fine day, but only for about an hour. This was before the PLB era. After reading Ritter's post carefully, I think he may be suggesting that get a PLB.

And yes, it sounds like you have an extremely fascinating job.