Piling on to the google alternatives heap: https://searx.space/

You can pick a public instance of searxng and choose which engines it queries by going to the setting cog, then Engines. A few of these public instances I've checked out have only google enabled, though, so you really do need to check the settings.

If you want to add a searxng instance as your default engine and your browser doesn't automatically do it, the URL for that is: https://<searxng_url>/search?q=%s

I have to add this manually for things like ironfox/firefox mobile.