You can consider recreating its design by using a page builder. Easily with drag and drop mechanism, no coding requires, any element such as Newsletter form, countdown timer are all available.
You can create a landing page without and app or subscription. Just check this tutorial https://made4uo.com/blogs/journey-to-awesome-shopify-website/create-a-landing-page-without-and-app-o.... It will provide instruction on how to create a customizable landing page and inter-changeable alternate home page