Wouldn't it be a good idea to ask the guys over at the defunct MRAI to see if you could use their flightplans as a base, and then you only have to update the old ones? Probably less work for you too. Then again I'm not familiar with the process you use for making them. Just a thought.
We've actually developed our own timetable reader, so the time it takes to create a flightplan from scratch is less than 10 minutes. It's actually much harder to update flightplans than it is to create them from scratch.