Hi list!
I got a more clear response from the organizers on this issue than anything I've seen in this thread so far - here it is:
Hi Ben,
thanks for your Interest in our Call.
We accepts only patches made with Kyma or Max/MSP due the fact we are not able to provide financial support for the two selected composers. So it is possible that they will not be able to be in Milan for the concert. To avoid technical issues we choose the plattforms we already use in our work or we are very familiar with. This is the only reason. If the selected composer can assure us to be available for the concert the can be used any piece of software/hardware.
I hope this helps.
Many thanks
Federico Placidi