Any way to install different voices to run off USB for Balabolka app?

Hi all
I'm fairly certain (from my somewhat limited computer knowledge) that this isn't possible, but thought I'd ask in case I'm wrong.

I have a student who is going to run Balabolka off a USB for use on her school's exam laptops. As the laptops are just pulled from a bank, there is no way to ensure she is given the same computer every time, nor what voices are installed. She is also without install privileges. She would like to listen to an Australian English voice (for which we have the executable file) but is there any way to have this 'install' on the USB too, so that Balabolka detects it as an option?

Thanks in advance!