I think the problem is that djay 2 does not react to virtual MIDI for this type of control. It has a number of devices it does support natively and in theory you could map the z1 to one of those devices if you had the MIDI specs. available for each using the Stream Byter. This would not be trivial and I suspect futile based on my first sentence, but that is just my opinion. I don't have direct experience with the djay app nor those dj type devices.
I'd say your only viable options are to get a device it supports or hope/ask that Algoriddim add support for the z1