Since my interactive celestial map is working fine now, it makes sense to change the previously static asterisms map to an interactive display. It now has the possibility to select asterisms by average brightness, optionally show constellations and guiding lines between the brightest stars, and limit the display of stars by magnitude. The latter will also make the sky background grayer and let the Milky Way band vanish into the mist to simulate the effect of light pollution.
Meanwhile, below is a regular interactive version of the asterism map, with zooming and panning.
Check out the documentation or download the D3-Celestial source in the GitHub repository.