EC145 with twin Arriel 1E2 power units allows for Cat. A ops up to performance class 1,
it has more than enough goods for a low temp 7000 ft alt. pickup.
A variant called the UH-72A Lakota , was selected by the U.S Army as its LUH.
https://www.airbushelicoptersinc.com/products/UH-72A-specifications.asp- military RW pilots all train for high altitude now because of Afghanistan - hell, the average ground elevation there is over 4000 feet
and most mountain ranges average 14000 to 20000 feet - at best power margins are 80-85% of what they are at sea-level.
That's why the heavy lifters like the Chinook do better there. No single engine capability to speak of ...
welll keep in mind that in 2005, a single engine high performance AS350-B3 conducted 29,000 ft. rescue on Everest.
(certified to MOA of 23,000 feet)
It actually went to 29,500 to set up an approach and touch down on the mountain.