Problem is that Traktor can output all four slots as only one stereo signal. However if you manage to route audio from Slot Monitor CUE than you could create an Ableton script that solos and gives EQ control for one Slot at a time.
Youre overthinking it. Remix decks arent really meant for playing whole tracks that need to be EQd. A high/low pass filter should give you all you need to sit the samples in the mix.
Traktors Remix decks are just a dumbed down, simplified version of Live anyway. Traktor is not a DAW, it’s certainly not something you’d build a studio around.
You are massively over-thinking what you think you need to do.