I started working on this a little more this morning, now that I've figured out a good setup for easy/quick file transfer to/from my PC while being able to maintian an internet connection (at school where my 3DS can't connect to the school network). I've finally got the hang of the old editor, and I'm a fair ways into making an expert chart for Senbonzakura. The only problem is that the 3DS version uses the full song, while the Project Diva F chart that I'm going off of uses a shortened version, so I'm gonna have to add some of my own notes. It won't be an exact port, but it'll be close.
Edit: For some reason, after 60 notes, the notes become invisible/off screen or something.
Edit 2: Button config was set to 0, 0, 0, 0, 0, 2000, changed it to 0, 0, 0, 0, 0, 0 and it worked again