Although this loader was initially created for use with Windows VirtualBox version, part of it can be used on Linux version as well.
Patching VirtualBox on Linux
http://www.kernelmode.info/forum/viewtopic.php?p=29627#p29627
More vboxmanage converted scripts examples
Post about VirtualBox recompilation
http://www.kernelmode.info/forum/viewtopic.php?p=29030#p29030
Example patched files for 5.1.16 deb package version
http://www.kernelmode.info/forum/viewtopic.php?p=29627#p29632