I lived in Nepal for a few years and rode on this route once in the opposite direction. Pokhara is around 1500 ft, and Jomsom is a 2400 ft strip at 9000 between Annapurna and Dhaulagiri, two 8000m+ mountains. This route must be flown VFR up the gorge between the mountains, flying through passes not far AGL (the planes are unpressurized of course). It is a dangerous flight, and if any weather comes in there aren’t many options.