I have a sound driver in development that might make these samples more manageable... partially because I could in theory reduce the memory footprint in the music data department. The other benefit? Sample swapping. The samples alone take up roughly half of the SPC700 memory, and about a quarter more of that is taken up by the pattern data (when stored as .IT data).
I actually got carried away with sound driver development, which is why I failed to make another entry.