That sounds like a good plan. I've been reading up on all of the different factors so I can manipulate it just how I want it!
If you want I can send you my list of how to do it. I'm unsure of if it will work 100% because I haven't got up to it yet, but based on other playthroughs it should work.
Also, cutting it down from 12 (If you have DLC) to 2 is significantly harder than from 10 to 2.