The easiest way would be finding someone who want to send money from usa to nepal. You take $ with him here and give his family NPR there. I did many times that way.  I understand it is hard to find someone who wants to send 50000 in that case you can break up the transaction for 4/5 times. 10000 each time. it would be time consuming though. but NRB (Nepal Rastra Bank) will not approve to send you money from nepal to usa so this is the best option.