If you're obsessed about keeping the geometry as clean as possible it will be very hard.
I would do something as described in the attached pic, but it may stand out a bit. see how it looks after you smooth the edges and go on from there.

Something else you should know is that you don't have to plan the entire geometry in advance. You can model the basic shape and add geometry with various tools, such as bevel and add edge loop tool which you could have used here.

Benny