[onthedole]

Learn to draw.

As you said you need more time to think about it. You need to do it during the meeting as the opportunity to argue your point may be lost afterwards. I think the best thing is to help you understand and clearly see the points you can argue and provide a good cost/benefit analysis. By drawing/sketching you make it easier for you to visualise all the points and then make a solid counter argument. You also gain some time to think about the problem.

You should be then able to articulate your position in a few short clear statements that everyone in the meeting can remember and even the note take can easily jot down an email everyone later

I would then use a whiteboard if available or even a marker and an A3 sheet will do.