That's likely possible. A lot of times, manufactures put most of the wiring harness in for all the different options and you can simply plug them in when you get them. However, I'm not 100% sure about this since the Navi is just a software/hardware UPGRADE for the system that is already in the Touring package... The thing is that the computer is wired to almost everything in the entire car... Tire pressure, OBD, Audio System, climate controls, etc... So I'm not sure if they wire the base trim for all that stuff. But it's a good chance that they do.
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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary
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