My USB-C to Magsafe adapter is currently in the prototype phase. I'm really interested in what you didn't like in the design so I can fix it in the final product. I'm in the same boat as you, but most of my devices including my work laptop uses USB-C for charging. I want to cut down on the number of chargers I have to bring with myself I going somewhere. Also, I really like that I can "dock" my work laptop with only one cable.