'Install Wordpress ONLY as the landing page?

I currently have a full site developed using custom html, php & css, however find updating the home page time consuming (startup- multiple iterations). I've seen people installing wordpress on subdomains (test.example.com) and even subpages (example.com/test) but amn yet to see someone install it as the landing page itself. Is this possible without a redirect? If so, how?

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