有没有办法在搜索失败时建议用 DuckDuckGo 替代 Google?

When a search returns no results, there’s a suggestion to try a Google search. We can alter the text above the button and could even alter the button label. But is there a way to change the button to use DuckDuckGo instead of Google? We do not want to endorse use of Google.

Changing the actual form looks like it’ll need a theme component with custom javascript written, because it looks like js.google_search doesn’t actually work?