This https://i.imgur.com/fTRrVnP.png is not gone, look it's right there.

It’s gone for me, and there are a lot of frustrated support threads from other Europeans so I’m not alone.

I managed to find the option on the advanced search on ebay.ie, but I still get page after page of American items as the result…

It was gone for years, it's useful that they've recently restored the option.