For Windows 8, the key you enter decides. Enter a VL key and it will switch to Volume. No conversion necessary. Only Office needs to be converted.
But in case I make an aio with professional (MSDN/Retail), professional with Windows media center (retail) and enterprise, and use the $oem $ of kmspivo 6.1 to pre activate, will work?
Only problem would be the Win Pro WMC, as KMSpico afaik won´t activate it. In that case the solution by murphy78 using KMSServerService and a GVLK for Win Pro WMC might work.