The NoAI should be the standard and people who wish to play with the sloppy diarrhea could put those features on in the settings - not the other way around and have the settings reset after each time you clear cookies. But gee, thanks for this at least.
I recently was able to change the search engine in my browser (Firefox) from AI-DDG to the NoAI-DDG, and I did it by adding a custom search engine. The URL needed for that, in Firefox, is https://noai.duckduckgo.com/?q=%25s