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The problem I face now? The interface. This device is solely for connecting to another USB host device and transferring files. The difficulty is that it is not, in fact, mini USB. It's some weird proprietary connector, which makes no sense as it is roughly the same size as mini USB.

Take a pic of it?

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So, given that the other end is a regular USB connector, how hard would it be for someone like me to chop it off and replace it with a mini USB connector?

Buy a mini USB cable, chop it in half, use a multimeter to work out which wires go to what pin, chop the cable that it comes with the MP3 player in half, use the multimeter again, wire them together correctly. Done