Ditto. Just buy more chucks one for each set of jaws you want, problem solved. With a little patience , one can often find bargain used deals on eBay from folks selling something they don't realize what they have. (My last Supernova 2 I got for $49 plus shipping used, it arrived looking like new... paid less for the chuck than the set of nova jaws I wanted it for!)
Oh yeah as far as changing out jaw SLIDES while jaws are mounted on them, I can imagine all sorts of alignment problems, they'd have to be started in exactly the correct order, or they won't align properly... Easier and less troublesome to simply change the jaws (I read on other thread you mention worrying about messing up the screws - They are easily replaceable items so I always have an extra set just in case... and as far as stripping the sockets (or breaking the hex key or that painful snap when they first loosen) that's caused by overtightening them. It is very, very easy to overtighten the jaw screws - so I quickly learned to just run them in until I couldn't turn the shaft of the hex key in my fingers (not the L tang of it) like rolling a pencil (screw's "just snug") and then give it only 1/4 of a turn extra (or get a torque screwdriver and set it to 10 to 15 inch pounds) that'll be PLENTY tight enough for those countersunk screws