I am not reading all comments,
yet replying.
Is it completely legal to keep two citizenships at a time (in your case Neal's and US)?
I know that there is also another option called NRN Visa which allows you to live in Nepal for longer period of time.
You can even sell American Property and Buy in Nepal with proper insurance etc. for sustaining long term passive income. Everybody knows, its is house and house rent here too.
Regaining Nepalese citizenship if you give u American Citizenship should not be a problem.