Browser Default Search Modification

I need an expert in browser technology to adjust the default search engine in both Chrome and Edge. This should work without the need for an extension.

Key Requirements:
- Default Search: The modification should redirect to a search engine other than Google or Bing.
- No Extension: The solution should not rely on or require any browser extension to function.
- Customization: The default search engine should be customizable, allowing me to set the search parameters as needed.

Ideal Skills and Experience:
- Proficient in Chrome and Edge browser technologies.
- Prior experience with browser search modifications.
- Strong understanding of browser default settings.

Please provide details of your relevant experience in your proposal. Thank you.