I think Pixar would do better than a live-action if Pixar tried to form a brand new movie similar to Brave but with a different animal. If Pixar tried to form this brand new movie it woud be forming special movie of street cats and wild cat of London and also Circus lions all in the same active video. It's speaking so the Lion Boy Triology could have a chance to be put into motion picture, because to me this triology beats Tarzan, it beats Duma's movie, it beats Two Brother, and it also would probably have a bit of a higher rate than the sequel of White Fang done by Disney.
I'd do this movie Lion Boy very similar to Brave this kid goes from London to Paris, from Paris to Venice and then tries to reach Africa, like Merida was determined to save her mother, this boy is determined to save these circus lions he loves cats but he's also able to speak cat so he has to struggle since some people spy on his trip but he's skillful at keeping the lions out of trouble, he's able to surprise the lions and make them halt their arguments, these circus lions also meet a sabertooth lion who one of the cats who runs on streets thinks might be a clone. Cats who run on the streets give this boy who can speak cat messages. This boy can control the lions better than a trainer who does circus stuff and that's why he's suddenly called Lion Boy. But then before this boy reaches Africa the sabertooth lion feels like Venice shall be his home since it's out of time like him.
This kid's trip could also be a little like sea adventures such as Free Willy, Flipper, and the Water Horse movies, because in the Lion Boy Triology books he's on a boat during most of his trip. I believe Pixar would be quite an expert at forming a brand new active movie after reading the books of this kid. This story even shares the flashback of why he can speak cat. This kid the circus people called Lion Boy he doesn't care if he's communicating with domestic cat breeds or with a wild cat species his cat language started with a baby leopard yowling after snake poison and his dad trying to save the cub while the mama leopard was there pacing. This kid himself was born in Africa ( west Africa ) His cool story a people and lots of cats would probably beat the Jungle Book a bit too. This kid can speak cat and he's loyal to them he shows more action than the kid in SecondHand Lion
Pixar is likely the company that could give this active story the best first chance.