You will NOT find a solution that you are looking for. Headway is the closest you will get. If you are looking to design sites, then we would recommend investing some time in learning the platform. That will vastly improve the overall quality of your work. I learnt by trial and error (exactly the same thing you are doing). Modifying existing themes to make it work for me. After a little bit of time, I was able to create my own themes. I would highly recommend you to not give up. The founder of genesis and StudioPress learnt the same way.
Let’s take a quick view on the keywords that are here. Accordingly, Spencer Haws, the creator of Long Tail Pro, he claims that any keyword below 30-35 is good to go with. However, these KC indexes tend to be skewed sometimes and I always like to do it manually as well. But as far as I can see, the keyword “Keurig coupons” follows my manual keyword research in a decent way. It’s not perfect, but close enough and I think if you would expand on this and fetch more long tail keywords related to it, you can actually rank for it.