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i was hoping to do exactly the same thing and reached out to Pioneer DJ support. After a few email back and forths the short answer is no.
I asked for an explanation why and their "technical team" will get back to me.
but after some digging i think (happy to be corrected as im no expert) its because you will have, effectively, 2 soundcards/interfaces running simultaneously... the IF2 and the onboard/inbuilt card from the DDJ-1000. The DDJ-1000 mixer is DVS enabled.
so what Pioneer want you to do is plug straight into the back of the DDJ- 1000 and pay the subscription. I think this is why a lot of their new hardware is all DVS enabled so people like us cant circumnavigate the subscription issue with the interface
The only compatible hardware the IF2 will work on are controllers and mixers that are not DVS enabled, which is older model mixers and the odd controller (XDJ RX2 being one i believe?)