You are probably better off using your expression pedal and Wah preset (I like CAE MC404 2 preset for Sweet Child o'mine).
Most Wahs like the Crybaby have a buffered input, which means there is some "tone suck" (usually a noticeable loss of top end) even when the pedal is bypassed. Plus they always tend to pick up radio interference which makes the tone inconsistent and less reliable, whereas the Kemper Wahs will always sound the same. Also, you can set the Kemper Wah to stop at bypass, this way you don't even have to worry about properly pressing the button down on the wah during a performance.
I have a VOX 847 moded with true bypass but still use an expression pedal instead with the Kemper.