The only method that might work would be a mix of live action and very cutting edge animation, like parts of Bakshi's uncompleted "Lord of the Rings" -- which was awful in itself but had some really good ideas buried in the mess.
dude, that was high school work from the last century; nay, the last millenium.
"Action" is not what the Chronicles of Narnia are about. If that's what you're after...maybe you want a Mel Gibson movie.
A fantasy about talking animals can only be carried off with first rate animation, like Disney used to do.