As I've written in my articles, removing the drive in the machine used for the build process avoids the need for any special settings in any of: - the target install process; - the GRUB re-installation; - the addition of rEFInd I know I'm lucky that my older laptop lets me easily unplug its internal drive - unlike my newer one for which the dismantling required is formidable. Still, such is only necessary to make these setups, which can then be used on any stock computer with USB booting.