Ok, here is what I've just found out, don't know if it works very well, but at first sight, it works!

Here is how I did it:
I opened the "XTCproject.pro" file located in PulsarappPulsarXTCApp. Now you see a wiring made by Pulsar v3 for your specific setup. I added the z-link source+dest (here without any errors!), added 8 more channels to both ASIO-modules, and connected the 16 new asio-channels with the input/output of the z-link-modules. Save (make backup of that file first!!!) and start cubase, now you have 8 more inputs and can route the output to 4 new stereo busses. I just found out that this trick does it, didn't test it! Try it and report if it works for you!
Cheers,
Robby