I think it could have great screenplay potential. I don't know if any of the Conchords axis would fit in, but then again, I would have never pegged Jemaine for Spook in Predicament.
In fact, it has already been made into an acclaimed movie that I cannot find anywhere.
As has Came A Hot Friday (it had Billy T. in it!). I'm looking for both the book and the film at non-insane prices.