I am not aware of a procedure to convert a Windows VM into a Bootcamp partition. I think it is best just to go with the standard Apple Bootcamp process. You might have to reactivate the Windows licence and may have to justify it to Microsoft as the licence has already been activated for the VM; I think this applies if the OS licence is Retail or OEM but maybe not for Enterprise licence. Strictly speaking OEM licence is not transferable
I was actually able to use Clonezilla. Just attach the image and physical drive to which you want to clone to the VM. Use Clonezilla to clone windows. If it is an external drive, you may need to boot the mac to recovery mode and allow booting from external media. After that, you can boot the cloned widows system like a BootCamp system. You can even bring it back in as a BootCamp VM in Fusion. (There is just some hassle with system protection that one must work around, see VMware Knowledge Base and I have not yet gotten the VM to boot with integrity protection re-enabled after editing the .vmdk) but in general, this seems to be working.
