Thanks to a comment in the Datahoarder community, I learned the UK site has a #RSS feed, so curious, I tried to dig if other regions also have.

First, the sites from #Nintendo I found that do have #RSSfeeds:

• Austria (German): https://www.nintendo.com/de-at/news.xml
• Belgium (Dutch): https://www.nintendo.com/nl-be/news.xml
• Belgium (French): https://www.nintendo.com/fr-be/news.xml
• France: https://www.nintendo.com/fr-fr/news.xml
• Germany: https://www.nintendo.com/de-de/news.xml
• Italy: https://www.nintendo.com/it-it/news.xml
• Japan: https://www.nintendo.co.jp/news/whatsnew.xml
• Netherlands: https://www.nintendo.com/nl-nl/news.xml
• Portugal: https://www.nintendo.com/pt-pt/news.xml
• Spain: https://www.nintendo.com/es-es/news.xml
• Switzerland (French): https://www.nintendo.com/fr-ch/news.xml
• Switzerland (German): https://www.nintendo.com/de-ch/news.xml
• Switzerland (Italian): https://www.nintendo.com/it-ch/news.xml

And also UK from the comment:

• https://www.nintendo.com/en-gb/news.xml

Also found an old article on the Wayback Machine mentioning a feed for the US site, the latest working snapshot being from 2007, but the links mentioned have since been discontinued:

• https://web.archive.org/web/20071022050835/http://www.nintendo.com/rssinfo

None of the other regional variants seem to have feeds, though.

Also I think I'll have to create a new group in the list of feeds I know. That's more variants than Steam's. 🥲