To my knowledge, there is not currently a way to do this is Tableau.
You are essentially wanting to show 3 bar marks with 2 line marks.
To use multiple marks for a plot type (i.e., bar, line) you have to use the special Measure Values measure.
However, you can only use 1 configuration of Measure Values per view.
There are several entries in the ideas section requesting such functionality in a future release:
You may have to copy and paste this link. I forget exactly what must be done to make it behave in the forums...
It's possible, not necessarily recommended in terms of visual practice, and may require some data reshaping depending on your data. See http://drawingwithnumbers.artisart.org/bars-and-lines/ for details.
Ha! I should've expected as much, Jonathan. I have even viewed the solution on your blog before. I've been away from forum answering for too long and have gotten rusty...