Currently, this is not possible, although I think it’s a super cool idea. Feel free to post this as a feature request in Suggestions so other people can vote on it as well!
Feel free to reach out with any other questions or suggestions. We love to hear your feedback!
This doesn’t answer your question totally, but maybe it will help…
For fun, sometimes I link up a Nintendo DS (with Korg DS10) to my DJ setup.
What I do is run Djay Pro on an iPad, then push that sound through a controller (Numark DJ2Go2 Touch), then a MakerHart JustMix 3 channel mixer. Djay Pro goes in ‘aux’, a microphone to ‘channel 1’.
I use a headphone splitter for the DS, with 1 cable to a mixer and 1 left open for headphones.
All beatmatching needs to be done by ear. Going DJ → DS is harder, you have to manually slow/speed up the BPM on Korg DS10 until it’s in sync. But you can only do that by like 1bpm/2bpm otherwise it gets hard to slow it down quickly enough when it’s in sync.
I try to be careful and only mix in to a longer track (or keep at the same BPM for several tracks) because it’s fiddly. Mixing out from DS to Djay is easier because you can nudge the record faster/slower so just manually beatmatch.