Getting a carrier of somesort will def. come in handy in case of emergencies.
You can clean the cage while they are in it, but please be very, very careful when sliding out the pullout pan in and out of the cage. We had an accident where Sesame decided to jump down suddenly (which she never did until this episode) when we were inserting the pan back in. Her two paws did get pinched, but the injuries were just superficial and no bones were broken. But, it was def. a wake-up call that chins will just be spontaneous, even if they are usually sleeping when you are cleaning.
If you buy one of those metal fence playpens from the pet store, it may be a bit short and your chin can scale or jump over it. Def. get some cardboard panels (the taller the better, about 4.5 ft to be safe) and line the entire playpen fence. This way, they can't jump over it. There is a thread about how to make this inexpensive playpen and it's great in protecting your wooden baseboards and too tall for chins to jump out of.