will the baked original and the unbaked one adhere to each other during the curing process?
The answer to this one is "yes." There are a couple of ways to prevent it, although you may have to be willing to sacrifice a couple of your pieces to test what works best. There's a commercial stuff called "Repel Gel" that's specifically engineered to allow people to bake two pieces together without them adhering (like a two-piece container - allowing them to bake the body and lid together for the best post-curing fit, without the two pieces sticking to each other) http://www.prairiecraft.com/pdf/repel_gel/repel_gel.pdfhttp://www.clayalley.com/kato.htm
Other, less expensive/more easily purchased releases include cornstarch and Armor-All (spray used in protecting car interiors.) I would think Armor-All would be more effective - the only possible problem I see is if you wanted to then put some sort of coating on the spirals, because Armor-All would "repel" that as well.
I would think if you dust the pieces heavily with cornstarch it would also work, but that can also have some impact on the appearance. Maybe someone else can speak to how to accomplish this?