Theme gallery for plone.org (Plone 5 themes)

(I am working on this):

Is there a way to 'import a less (settings) file from the command line'

Now: I have 'theme.less' which imports 'theme-variables.less' (font sizes and colors).
Would it be possible to do something like:

lessc 'theme.less' --with-redtheme-settings.less 'red-theme.css'

lessc 'theme.less' --with-bluetheme-settings.less 'blue-theme.css'