DJM 2000 + 2X CDJ2000 + Traktor F1 + Traktor Scratch Pro 2.5 (or 2.6)

Hi:

So, I just want to confirm before I go out and buy an external soundcard/audio interface to be able to use my Kontrol F1 along with my decks and DJM 2000.

There is no way I can assign an individual channel (or channels) in the mixer to the F1 while keeping the 2 CDJs on their respective channels in 6/2 mode to be able to record my mixes? 

I can do what I want in 8/0 mode, but then I can't record my mixes can I?

And on 6/2 the F1 "floats" on my CDJ channels, i.e. I can only hear the sounds from the F1 on one of the CDJ2000 channels but not in a separate channel...

The DJM900 Nexus is able to do this right?

Can someone please tell me if there is any other solution to my problem that doesn't involve getting an external soundcard?

Pulse? Gavin? 

I just got the F1 and I was hoping to use it along my CDJs, but in a separate channel...

Thanks,

F