It's impossible to be a purist! at one stage I was trying to avoid cacti and look at me now! I have learned to stick to plants that can manage in my conditions so I mostly don't grow Echeveria any more.
Your final plant is Cotyledon orbiculata cv Oophylla, it's a favourite of mine. Cotyledon pendens needs a lot of light to get red stripes, that's how it should be. In nature, they live on cliffs in harsh sunlight