Wow. Thanks guys; didn't expect to get any response. Now I know it's actually possible; I'll ask my dealer about it. THANKS!!
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My problem is that I don't even have the Nav menu in the MFD. When scrolling through, even with Navigation on, there's no Nav menu. I do think it's a coding issue (according to a few other posts I've found since posting my original); will find out this week when I take it back to the dealer. Thanks all! 
Done. I have navigation in the instrument cluster now. Also got an SL-style antenna for free. I asked the service advisor to order me one, he came back with with a quote of $110 painted. I asked him "how much would it cost unpainted [to match the SLK's rubbery base]?" He said, "oh, I'll take care of it if you don't need it painted." So.. picking it up this Friday. Hopefully unpainted = rubbery black.
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