So, in about an hour I banged together a simple GUI for Jeffrey Litz's wonderful ai2mpc Windows command line utility. I don't normally do Windows, but this was dead easy. It will allow you to select multiple Adobe Illustrator files and convert them to MPC files in a batch without having to use the command line. Only tested on WinXP, and even then it was not tested extensively, so there may be bugs.
Thing is, I can't let it off my computer because I haven't yet gotten permission from him. If/when I do, I'll post a link and anyone who wishes may have it for free.