I started a response, but deleted it as it got too long.
Short version, no, would not be interested in taking a barometer. I have spent a lot of time out doors, most of it on farm equipment, but a good share just being outside in the open. I don't need assistance in knowing what the weather is going to do in the next few hours and a very good idea what the marrow will bring.  Now, if it would let me know exactly what the weather is going to be in two days, different story.
Not sure i would bring along a Sherpa either, too may people, but a portage monkey sure would be handy in getting my bear bag rope unsnagged! ;)