Is it possible to trigger opus commands directly when opening a specific lister?

You'd need to use scripting.

  • OnOpenLister [Directory Opus Manual] lets your script do things in reaction to new windows opening.

  • Lister [Directory Opus Manual] has a layout property which you can use to know if the new window came from your special layout. (Or you could check which folders are loaded into the lister's tabs, etc., depending on how you want it to work.)

If you want it to happen for specific folders rather than layouts, there's already a script you can use/adapt for that: