True, they're not really designed for live playing. But they are capable.
The fantom has "soft keys" (buttons) that you can assin patches to. It's either 4 or 8 that you have available. You can change from patch to patch with this method.
You can also use a multi-timbral set up and lay out 16 different patches. All you have to do is use the channels to place your patches in the order that you need them.
If you need a performance setup, performances are user-writable, which means that you can lay out your performances and just go from performance to performance with the wheel or a button.
So it comes down to laying things out and going from there. Being familiar with your workstation helps a lot.