Adam, you can always inexpensively use two "Y" adapters when you listen to the Mono Box Set, then just remove them when you listen to everything else.
Perhaps a foolish question, but .....
I'm thinking about getting the newly released Beatles mono LP set. My integrated amp does not have a "mono switch," nor do I have a mono phono cartridge. Will I still be able to enjoy these mono LP's that everyone is raving about, or will I be wasting my money since my system is not equipped to specifically handle "mono" music ?