I'm trying to modify a style (American Chemical Society) so that when there are more than three authors, it only displays the final author instead of the first one. This is because generally the last author is the primary investigator and their name conveys more information.

This is for use in presentations and other less formal settings where it makes sense to only display the last author.

I've managed to get it to work using the et-al-display-last="true" setting, but using this option removes the "et al" from the author list.

I understand why it does this (generally users will set it to display the first X authors, then an ellipsis, then the last author), but I'm curious if it's possible to get it to display the "et al" when using this feature.

Any ideas?