Diosif,
I don't know if it's possibile to connect a Zip drive to the VA 5, but anyway the operative system of the keyboard wouldn't recognize it; you could argue that maybe one could then try to load the O.S. of the VA 7, but I am afraid that there is a "code" or something that prevents a model from loading the O.S. of another one...
Andrea
P.S.: in which part of Greece are you going to perform this summer?
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.