Sorry, I must have had a brain freeze with regards to the 18-200 DX. For a second I thought you were implying that it was an 18-200 in 135 format and the DX sensor would treat it as 27-300. DX lenses, unlike other (including older) Nikkors, are already labeled for the DX sensor.
You let me know how things go trying to retrofit a PhaseOne back onto that D2H.