Hi jdmedia, thanks a lot for the proposed solution. However, this was not exactly what I needed, and I see it is very complicated to implement.
In the meantime, I searched for other solutions to georeference wildlife sightings in Wordpress, and found a plugin called FLEXIBLE MAP, that allows me to put a lot of sightings coordinates in a KML file (about 200 or 250 coordinates is what I determined to run best), then reference this file from every Wordpress post as a plugin shortcode parameter and "voilà", our sigthings geocodes are now on the map, each one correctly identified and labelled, even on the map.
Thank you very much for your time, work and efforts. Best regards.