What you wrote in your blog is fine for a first approach. I know the difficulty of talking to a broad audience, especially to those that are not sold on the ecological side.
One thing I think you could use is the holistic approach. In permaculture you don't think of your garden as separate parts: everything is linked to something. If you grow a grape vine, that vine requires water, nutrients, a specific climate, something to hang over, but it also gives shades, humidity, it creates a microclimate allowing other species to grow nearby. and offers protection to animals which, in sufficient variety, will help with pest control. Follow some of its links. Water will take you to ponds or other water retention structures, and the plants and animals that will support that pond; ground covers that will help the rainwater to infiltrate; earthworks that will slow down runoff water. Nutrients will take you to companion species, beans for nitrogen, dinamic accumulators for minerals; composting is good for increasing microorganisms in the soil, which will help plants to acquaire nutrients (and a safe way to get rid of your kitchen waste). Microclimates will take you to where to plant trees, how to use walls, enclosures, stones for heat storage, irrigation, ... The thing the vine hangs over could be a wall, could be a small tree, a pergola; such elements in return might be used for something else. The shade the vine casts can be useful to grow lettuces, if given a proper slope. We're using here the reductionistic approach.
It is just a single element in your system, and you see how many links it has with the other elements. Now, if you want to think holistically, try to see the whole picture. Instead of thinking of the vine and its relationships, see the whole garden at once. Does it look healthy or anemic? Do you sense harmony or imbalance? How does it smell as you walk through it? Can you feel any emotion from the garden? Are there signs of stress somewhere? Find the source of whatever goes wrong. Is it an effect of a recent change you made? Changes take time to be fully integrated in your system, typically seven years. This is why permaculture reccomends small and slow changes, so you are able to see how these changes propagate in your system, learn how it works, how the other elements adapt, so you develop an intuition. If you make too many changes and too fast, you may end up with secondary effects you dislike, and you won't be able to figure how to solve it.
Another thing to consider is resilience. It might not be evident at first, but if you think about it, you'll notice several threats for your garden sustainability. Do you depend on external inputs? Fertlizer, seeds or seedlings, water, chemicals, tools, plastics, how confident are you that they will be still available in the near future? In a few decades? The next generation? If you want something that is permanent, it should be able to stand at least seven generations. Look again at your inputs. Heirloom seeds are hard to find now, since most of what you can purchase in stores are hybrid or GMO ones. Fertilizers and plastics depend on oil, which is a fossil fuel. Maybe the water you are using is fossil water, this is, coming from an acquifer that takes centuries to be filled. High tech tools comes from a highly complex society, which may not pass the test of time, it's ok to use some of these technologies as long as you don't depend on them. Also, an uncomfortable question, does your garden depend on you? If you had to flee from your home, had you return a few years later, what would you find?
If you've read
Sepp Holzer's Permaculture, the main theme of this book is 'Working with Nature, instead of against it'. This is another big topic of permaculture. If you want something to be permanent, let us do it the natural way, which is proven to be permanent. For example, if Nature is constantly growing herbs in your ground, instead of cutting them forever, try growing herbs you might like. If your soil is too compacted, maybe you can use earthworms to build galleries for you, just give them some food to come to the place. Water flows naturally from above to below, so retention water structures are best located in higher altitudes. If your garden is fine but a plant isn't thriving where you planted it, let it die (or cut it) and try another species. If you give
enough flowers, bees will settle and help you pollinize, providing a honeycomb box will allow you to collect some honey as a plus. If you leave your land completely to nature's will, only local wild plants would grow, so if you want it to grow something different, you have to create microclimates and introduce species adapted to those microclimates. How to create microclimates is another topic which gives stuff for a book.