I hate bumping a thread from 4 1/2 years ago, but I just saw a video that referenced this and came back the RWP to see if it had been discussed.
https://www.youtube.com/watch?v=WcWfwvsw7Jw
This is fascinating, and made me dig up my old notes on the BK hacking I was doing over a decade ago. My last efforts, left unfinished, were trying to get the BK cut scenes to fire from start up of the game. We see them via Sandcastle codes, but a hot swap of some memory to BK should have triggered a cut scene to be displayed. I never could reconcile when the cut scene would have been displayed, but was looking at the initial musical prelude since the SNS data, when retrieved via sandcastle code, was stored outside of and not specific to a game save. In hindsight, displaying a cut scene from the start room, Banjos house, would make some sense.
The was very interesting and brought back some fun memories.