A high altitude helicopter is available that can climb to 30,000 feet,( i am sure it takes a while) so am told. The mountain should be cleaned by trained aircrews who could fly up collect the crap and bodies and fly down to the base camp.
Fishtail Air out of Katmandu has a several Eurocopter AS350 B3’s. These helicopters have a max rescue altitude of 23, 000 feet and they accomplish that by flying with minimum fuel (8 gallons which permits 20 minutes of flying time). They charge $2500 per hour of operation. Trash pickup would cost a fortune.