I typed that first post from my phone, and midi export from Notion 6 is rather gnarly! A lot of the CC info is not there, and even passing it over to Studio One 4 was lacking (no instrument assignments, etc.). I just was playing with the "Awakening Notions" piece, and sounds great in Notion itself, but is also using the built-in libraries. That option might not be viable at all for what you are seeking.
Jerry Gerber (
JSG on the forums) is the first person that comes to mind when you are talking classical pieces. I cannot remember now if he has posted midi files specifically though. I just shot him a PM in hopes that he would have a couple minutes to chime in here.