I recently acquired a Vestax PMC 06 ProA analog mixer and I was thinking of buying a turntable, but then I saw that the SC6000M has two line outputs (Layer A and B) and would fit the bill as a portable scratch setup, wherein Layer A would be connected to one channel for break beats/drum track and layer B for the scratch sample/scratch track.
Yup. And switching btwn layers is one button press away. You can even change the lighting of the decks to your liking so you can visually differentiate between layers A & B.
While I am no scratch DJ, I have done this exact thing to practice, even with 4x SC6000Ms.