I haven't tried this for adding a parameter but check this article about turning off the AI summary: https://www.tomshardware.com/software/google-chrome/bye-bye-ai-how-to-block-googles-annoying-ai-overviews-and-just-get-search-results
Jump down to "How to block AI overviews when searching from Chrome's address bar on the Desktop" and they walk through adding a Google search with an & parameter. Not sure if it will accept a -site: but worth a try
“First they say, ‘Sir, how do you do it? How do you wake up in the morning and put on your pants?’” Trump mused. “And I say, ‘Well, I don’t think about it too much.’ I don’t want to think about it because if I think about it too much maybe I won’t want to do it, but I love it because we’re going to do something for this country that’s never been done before.”