Here is an alternative way.

Get an additional check card and send it to your parents and ask them to use that card in any ATM machine in Nepal to withdraw money.

Let's say they withdraw $100 using your debit card. Your bak will charge $5 international ATM charge. Todays Rastra Bank's forex is

They will get ($100-$5) x 80.00 = NPR 7600

If you use Muncha or similar service their rate is USD 1 = NPR 77.9130

Your parents will receive ($100-$6.99) x 77.9130 = NPR 7246.6 + 2 business days wait