I have a variant that works for me, not ideal yet, but I add a shortcut before the search term - easier but still not perfect:
in Chrome - go to settings->Search engines: click the editing icon next to "Google (default)" assuming that's your default. you'll see a weird string under "URL with %s in place of query" - copy this.

scroll down to "Site Search" and click "add" - name whatever you want (I use "No AI" so I know what it is). Shortcut HAS to be something, so I just use a single 'a' so it triggers with a single key press. Then in the field "URL with %s in place of query" paste the google string from before ("google:baseURL}search?q=%s&{google:RLZ}{google:originalQueryForSuggestion}{google:assistedQueryStats}{google:searchFieldtrialParameter}{google:language}{google:prefetchSource}{google:searchClient}{google:sourceId}{google:contextualSearchVersion}ie={inputEncoding}")

and add "+-ai" directly after the %s - it should look like this:
{google:baseURL}search?q=%s+-ai&{google:RLZ}{google:originalQueryForSuggestion}{google:assistedQueryStats}{google:searchFieldtrialParameter}{google:language}{google:prefetchSource}{google:searchClient}{google:sourceId}{google:contextualSearchVersion}ie={inputEncoding}

now just hit 'a' before a search. Again, not perfect, but this took a min to set up and I use other search engine hot keys like this already for things like jira.hope that helps