Firing Kodi Add-On Actions?

Is there a way I can fire add-on actions within Kodi via Home Assistant? I want EmbyCon to prompt for which user is active when I start the corresponding activity with my Logitech Harmony remote. Under EmbyCon’s add-on actions there’s a “switch user” option, which can be added to the Kodi home screen and pops up a list of available users when selected. Having it on my home screen is passable as an option, but I’d really like a way to fire it whenever the activity starts so the correct user is always selected.