The main issue for me is the fact that Deepfreeze will remove all new files installed on the system partition (The C:\) drive of the local disk, and the other partition is too small to hold anything TBH, as well as removing any new registry keys. That's why I need it to be "portable". It probably won't be used portably, it's just portable apps don't install registry keys and can be installed on flash drives.
So, I will try getting that portable virtual box program when I'm at home.