Please do. I would like to do the same.
Stanimal, here's what I found out.
The PO said the front was a plug and play except for needing a Duke brake disc.
He said the the rear needed the Duke spacers to fit properly. He recommended looking up the part numbers on KTM fiche to find what spacers are needed.
I decided to do just that, as much for my own knowledge should there be a problem or question.
I'm confused based on what he told me and what I found on the parts fiche for the 08 SMC and an 08 Duke. I think he may have gotten it backwards.
1. The front axles are the same part #(75009081000). The front wheel spacers SMC (75009012000) and Duke (78009012000) are different.
2. The rear axles part # were the same but the Duke now has a different (updated) part #. The spacers (right side and on either side of the cush drive) are the same for the SMC and the Duke. I believe my rim has the Duke cush drive, not the SMC.
So.... I'm a bit confused based on what he told me and what the fiche says. However, maybe it just works out as he said, based on width of the triples, rim, etc.
I plan on pulling the wheels off in a few weeks when I give the bike a thorough inspection. I can measure the spacers and send you the info. You can check those dimensions against your stock spacers to confirm whats needed. Regardless, it appears only a swap of spacers and a Duke front disc is needed get the job done.