I'm curious. You're doing a big beer with directions that call for 5-6 total weeks in primary/secondary (and most agree that directions are aimed at the absolute minimum timeframes). You're going to cut that to 4 weeks, right?
Will you have beer? Sure. Will it be as good as it might have been? I think it's getting foggy, now.
The secondary (which can be skipped, unless adding fruit, dry hopping, etc) is for batch aging as well as clarifying. Cold crashing for a week will do the clarifying, but you'll also knock the yeast dormant - which is going to hurt the batch aging process.
You may prefer your big beers to be on the young/green side... if that's the case, go for it. If not, you may want to rethink your plan,or be prepared for a longer than expected period of bottle conditioning for this beer to hit its stride.