Hey Suzy,
Unsetting the WooCommerce Shop Page is not recommended as it’s used throughout WooCommerce like you’ll get a 404 error if you go to the Cart page.
With that said, I’d recommend that you create a Global Block and put your custom shop content in that block. Then, insert the Global Block Shortcode in your Shop content. In the following screenshots, you see the word “test” added in the content area and how it’s displayed in the WC Shop Page. That “test” word can be replaced with a shortcode. Just make sure you use the WordPress HTML editor or the Shortcode Block to add shortcodes because otherwise, it will display the shortcode as text.


The only problem after that is if you want to remove the product listing below it as this would require custom WooCommerce development. I’d recommend just leaving this to display the products or the categories to avoid having to custom code saving you from additional future maintenance.
Hope those can be considered.