I agree that the Crossover pipes are kind of a PITA. I used to love dropping the exhaust on my Chevelle at the track and running the open headers. Pulled them off to the side and put 1 bolt back in the collector just to hung them up. I installed a Flomaster full system with an H-pipe and never dropped the exhaust since.
Now that I'm typing this, I realize how much I missed that feeling at the track. Here is what I plan on doing, and I think it would be a great option for this original situation where a muffler change is in order.
I've used these V-band clamps on turbo cars in the past. They are an excellent way to manage exhaust pipe, allowing for simple removal and re-installation without any leaks.
So I plan installing these on at least the front side of my mufflers so I can easily drop out the H-pipe system.