Find a way to float it out of there. Yes it will land somewhere sometime but probably be easier to dispose of at a lower altitude.
The people finding all that trash may actually be able to use the metal for something.
Hire sherpas to carry in hot air balloon like devices that can be used to lift the trash out of there and where ever it falls later the locals would probably be able to use it for something.
Just a thought. Probably went over like a Lead(Led) Zepplin.
The Sherpas go up and down the mountain 20 times for every time a tour climber does. Let the governments pay them for each pound of trash they bring back down. And let them keep the trash to do with as they will. You’re right: someone can probably put it to good use.