Wokiee Theme Bundle Selector Setup

I already own the premium Wokiee Shopify theme and need it fully installed and configured on my store. Once the theme is live, the product page must support a “Buy 2 Get 2 Free” bundle option: customers should be able to pick any four pieces from the same product line, with the cart automatically charging for only two and clearly showing the savings.

Here is what I expect from you:
• Clean installation and initial configuration of the Wokiee theme, keeping all core features intact.
• A product-page customization (app-based or custom Liquid/JavaScript) that lets shoppers select four individual pieces, updates the price in real time, and passes the correct bundle data through to checkout. If costumer picks that offer 3 gifts to be available from him.
• Styling of the selector so it blends seamlessly with Wokiee’s design on desktop and mobile.
• Basic QA to confirm the promotion works across multiple browsers and on the Shopify mobile app.

I’m focused solely on this product customization option—even though Wokiee offers review widgets and related-product blocks, those can remain untouched for now. Please tell me whether you plan to leverage an existing bundle app or write the mechanism from scratch, and how long each approach will take.