Well yes and no. since the exhausts go into the head at an angle the pipes need to be spread at least a bit to get them free of the head and spread even more to clear the front frame down tubes and front engine mount. The crossover is behind the center stand. Maybe if the center stand was off and you had a big friend to lift the rear of the bike to get the pipes out the back under the tire. The side stand gets in the way too, but could be removed. All in all separating the crossover is simplest, but on many pipes the tubes collapse where rust has thinned them before the joint comes apart.
Rusty bolts 101; any time a bolt becomes harder to turn as it's backed out, STOP, run the bolt in a turn or two, apply more rust buster, loosen again, repeat as needed til it's all the way off. The bolt getting hard to turn is metal peeling and galling from rust getting jammed in the threads. tightening it smooths the threads some.