You know what … you can minimize the visual impact of a new beam with some labor and joist hangers. Rather than simply adding the new beam under the joists, cut a 3” wide gap in all the joists and push the beam up tight under the deck boards. Hang the existing joists off the sides of the new beam. You will “hide” 8” of the new beam.The simple solution is to add a beam somewhere between 8ft and 12ft from the house. Leave the original post as is.