Yes, The customer can benefit for the Trade preference agreement. There is facility of GSP which will allow the customer to import goods from Nepal with "No" or "less" custom duties. The generous donor countries for facilitation GSP facility to Nepal are Australia, Belarus, Canada, European Union, Iceland, Japan, Kazakhstan, New Zealand, Norway, Russian Federation, Switzerland, Turkey, United States. There is also Trade preference program from United States to Nepal that allows Nepalese products with Duty-free access to United States till 31 December 2025.
Links for the GSP and US Trade Preference facility.
GSP Donors to Nepal
Nepal Trade Preference Program by USA