Add inside column border to table header row

Hi,

I've been trying everything but cannot seem to accomplish what I want. I have a table style set up with cell styles. The table will not have an outside border, but will have column borders and a top and bottom row border for the header row and end of table. I want it to look like this:

However; I have to manually add in that middle column border in the header row as well as remove the inside row strokes manually as there is no option in cell styles to change that otherwise it looks like this:

My body cells are using a left and right cell style in order to get the "middle" column border.

Am I missing something? I feel like it should be simple and I have too many tables to keep manually applying the strokes to.

Thank you!