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That is the ultimate, Number ONE reason why I went with Tanabe Coilovers on my Accord previously, and will be sticking with them on the G, you can do just that, raise it up for the winter (higher than stock), and lower it back down when the season is over. The Zs/Gs can be driven year round, but of course it wasn't designed to be a WINTER car, so you have to adapt your driving habits.
For the 350Z Tanabe's web site lists the max height gain for the Sustec Pro S-OC and Pro S-OC Type II coilovers as 1/4" front and zero gain for the rear. They do allow for oem ride height, but hardly allow what he's hoping for. Tanabe's Pro Seven coilovers, which have full height adjustablity, show no specs on ride height adjustablity.