Is it possible to add a landing page with a completely different design to a multi-page site on WP?

Question

WordPress

Is it possible to add a landing page with a completely different design to a multi-page site on WP?
The customer requires this, but this is the first time I have encountered this, tell me, please

Answer 1

Of course it is possible.
You can implement it in different ways ...
1) create separate templates. For example, header-landing.php footer-landing.php page-landing.php
Next, in functions.php check the logic is_page()to dequeue standard scripts and styles and include scripts and styles for landing.
2) create a new theme and use ready-made plugins to assign this theme to the desired pages.
An example of such a plugin is https://wordpress.org/plugins/jonradio-multiple-themes/
Search Google for Wordpress multiple themes.
I think the first way is better