Welcome to our new beta design! Click here to go back to the old Newschoolers.
They are called Alpine Trekkers and they are made by Back Country Access. They sound like they would be a good fit for the OP. They are heavy, and they aren't cheap, but you may be able to find a used pair on TGR, or maybe egay.
Don't forget that you need a pair of skins, once again, since you are only going to be going three times, try to find a used pair in decent condition.