I am fully aware I can open a Lightroom DNG in Photoshop or Open a Lightroom DNG as a Smart Object In Photoshop, however in both cases the link between the original DNG and the Photoshop file is broken. In the former case, Photoshop renders the DNG (losing its RAW editability) and in the latter it embeds the RAW data within the Photoshop file and allows it to be edited as and when using ACR, but this data is now baked into the PSD.
However, what I really want is a way to place a Lightroom DNG in a Photoshop document in the same way I could place (for example) an Illustrator file. So that what is rendered in Photoshop is a live version of the DNG, meaning any edits I make to the DNG in Lightroom are echoed in Photoshop. I have no interest or need in using ACR or editing the DNG from within Photoshop. All I need is for changes made in Lightroom to be reflected in Photoshop. I can do this with a variety of other file formats, but seemingly not using a Lightroom DNG.