so someone would have to make himself friend with Winbond and suggest them an universal Gang device programmer

Not sure this worth it, look at current storage device pricing and add a higher level Microcontroller to it... NO way you're going to be over the Price of any single Winbond IC... not to mention you can update any part of your firmware and sound using a simple bootloading process.

Roman Black sounds almost the same as most Winbond solution and it's free, MP3 codec ICs are cheap, DsPIC are also cheaper... food for thought.