While my hacking ability is limited to inputting codes, I think I understand the workings of a game well enough to post my input.
As far as these silos go, I would figure that while the activation code was triggered to place it on the menu, it still lacks an address for its destinaiton. For instance, I suppose it's entirely possible to change the destination address on one of the choices to make Banjo emerge from, say... Jiggywiggy's temple?
The real challenge is finding the actual area in the game code, kinda like the Citadel in GoldenEye.
I'm not sure how insane this sounds, but whatever.
I'd love to hack more and learn properly what it is I'm talking about, but I only have one BK and BT game pak each, and I don't want to ruin them by my screwing up.