As mentioned, I can’t find an app on the store to do what I need. They all involve a lot more than we need, or give random permissions to a third party app that’s nothing to do with what we’re after.
We’re not trying to fundamentally change things but at a minimum, we just need to show the SKU underneath the product variant on the cart page - surely there is a simple way to do this?
The cart template code is basically empty, so I’m assuming it’s the sections tab that I’d need to edit for the symmetry theme.