I actually had an idea like this before

https://youtu.be/Xh8oH-18peM

This actually made me cry a little... Rip Kion. (looks like Fuli, Rani, and everyone else you ship Kion with are gonna have to find someone else now lol)

Eliza kinda fits Nala too

Story's pretty straight forward. Kion dies after defeating Scar and his army.