Ukulele Pickup???

Any suggestions on a pickup that is fairly easy to transfer among different Uke's??? I have a friend that has up to 4 different Uke's that she uses live, and rather than micing I was wondering about something similar/smaller than the LR Baggs M1A that could easily switch between sets....

I've considered one of these...

http://www.schattendesign.com/uke.htm