Before the second year of WLM, ErfgoedBot added monument-ID-templates to the Commons file pages for files which were used in monument lists. (See contributions 2012-08-31). However, it was a one-time action only.
I think, we need a permanent tool which would add monument-ID-templates automatically or semi-automatically daily:
- to file pages of files used in monument list, if the file page lacks such a template
- to category pages linked as "commonscat" in monument list if the category page lacks such a template
- to Wikipedia articles linked from the monument list as the main article about the monument