What are some suggestions for preparing a GTM plan particularly for a bundled product launch?

This is a taxonomy question. When I look at bundled products, I consider what is part of the bundle. In your details you shared that there is only 1 SKU and all subproducts must be purchased together. So why is the language product (parent position) and subproducts (child position)? Instead, could you look at this as a simply a product (parent position) with strong supporting features (child position)? If yes, then consider the following. When you're launching, you're focused on the primary value, positioning, messaging, competitive differentiators, etc. of the product. As new features come to market (beta > limited availability > GA) you evaluate the impact those features have in the market and the specific value it brings to your target audience. In this taxonomy, you're no longer creating a battle of words and hierarchy, but one of prioritization. The product (parent position) being the main focus of your GTM with the features playing supportive roles.