Whatever you do, don't specialize the tool too much, even at the cost of the users having to do more work. The more assumptions you build in, the sooner it's g

Whatever you do, don't specialize the tool too much, even at the cost of the users having to do more work. The more assumptions you build in, the sooner it's going to stop working for them and they all go back to Excel. Furthermore, I'd swallow my pride and write something in VB.NET. Under the circumstances, it sounds like that's the only thing the users have a ghost of a chance of maintaining.