is there a way to reverse the positions of the northing/easting values in the workbook under the sites tab?

Yeh. I don't think I know anyone in America that uses Eastings and Northings while surveying.

In 25 years of surveying I've seen Northings and Eastings, except from some softare packages(beginning circa 1985 or so) that seem to be made by mathematicians and not surveyors.

To me this is as bad as putting underwear on after putting on your pants.