AHC Nepalese Civil War

From Wiki:
The Nepalese Civil War was an armed conflict between the Communist Party of Nepal (Maoist) (CPN-M) and the government of Nepal, fought from 1996 to 2006. The rebellion was launched by the CPN-M on 13 February 1996 with the main aim of overthrowing the Nepalese monarchy and establishing a People's Republic. It ended with the Comprehensive Peace Accord signed on 21 November 2006.

With a POD from 1991, how could the Nepalese monarchy triumph against the Maoist guerrillas? What changes politically, economically and militarily would need to happen for the government to quell the rebellion?
 
Best way might be that king Birenda survives from massacre on royal palace by his son. He was willingful negotiate and perhaps he could accept transition towards more parliamentary system.
 
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