You can use an EQ field as illustrated in the screen shot.
In the Font dialog box, change the position to Raised and specify a value that suits your document. I used 10 points in this example, but you may be able to specify a smaller value.
Note that in my example I am using a semi-colon to separate the arguments for the \o switch. If a comma is your list separator in Windows Control Panel, you should use that instead.
See also
http://wordfaqs.ssbarnhill.com/Overbar.htm.