Mike,
yes you can save the split point within a registration, but if you think to use the arranger the way you wrote, then I definitely advice a VA 76: on a VA 7 simply there isn't enough room (notes) to use your left hand that way.
Andrea
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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.