I know this is a pretty old post, but I'd like to mention that there is a fan game called Banjo-Dreamie being developed using the Banjo's Backpack mod. The creator has been doing it piece-by-piece for a long time now and I think he is just about finished with it.
Unlike the standard Banjo-Kazooie, Banjo-Dreamie makes you earn everything
. If I remember correctly, Banjo couldn't even attack until you find Bottles in the first level. It's an extremely challenging mod, but it's also pretty fairly laid out so you usually feel like it is your own fault when you screw up. The environments are also pretty noteworthy as they tend to have a surrealist quality to them.
I'd highly recommend it if you guys can hunt it down. https://www.youtube.com/watch?v=Kq40R1jK_98