No it wont work.
1. The DDJ-SX will not send the correct time codes as it is not certified for any of this and hence the CDJs connected to it will be useless apart from playing through the DDJ-SX internal mixer. Of course you can use the controller with Serato and Traktor, but neither will accept the CDJs.
As of now the specs of the SRT mixer say it is designed and certified to transport timecode to Serato DJ, hence it will not deliver the correct timecode (and certification) to work with Traktor in Traktor Scratch mode.
Of course the CDJs will work as timecode delivery for Serato… a very expensive one at that or as additional midi controllers.
So I would not get my hopes up too much…
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