You can't even change the browser on iOS. Apple forces all browsers to use the same rendering engine under the hood.

Not GP, but I open the browser (in my case Vivaldi) and type my query in the address box.

My default search engine on Vivaldi is DDG, it issues a query to DDG.

Do you actually use the default google shit widget to do web searches?

Opening the widget is useless because it shows the result in the Google app (a 350MB monster) and when you click to open a result it opens in app.

You can't have your browser's features, You can't open multiple results in multiple tabs you need to go back each time.

A better option is to add the browser's search widget on the home screen, it takes you straight to the address bar where you can enter your query. All modern browsers support searching from the address bar, no need to go to google.com