Looks like using https://github.com/Whonix/Whonix/blob/master/help-steps/analyze_image is currently too cumbersome. Haven't heard from anyone using it yet.
The first step to simplify it could be writing a wrapper that takes two images as input, such as:
sudo tool-name /path/to/first/file.ova /path/to/second/file.ova
Therefore wraps/abstracts the analyze_image script and sets the required parameters.