I think it depends on which scraper you use. The build in scraper doesn't care about countrys when using thegamesdb as source (because thegamesdb doesn't have multiple variations of covers).
Universal XML Scraper has that feature but i believe it depends on a setting in the tool what cover to scrape and not the filename. In UXS you can also select if you want plain gamenames or have (USA) etc included.
And i have no idea what sselphs can do.

@robertybob I had been toying with the idea of adding an extra system menu with the games you last played on RetroPie as a whole, as I myself had a similar need.

I'm not sure how feasible that would be, but it's certainly something I would love to have. Would that help with this use case? Visitors would probably mostly be interested in games played in that session, I assume - even though the list would span more games, probably the last 50-100?

Thanks for adding me here!

Edit: alternatively, if it's a numbering thing we'd be looking for, I'd likely suggest a script and doing that via gamelist name editing.

Edit 2: yeah, there is also a sorting option per system that can do the trick in the interim!