I like the Whole Foods idea and, assuming we purchase foodstuffs from them, we'd probably be okay, especially if we go upstairs where they probably wouldn't notice us sitting there for hours. But does it have wifi?
Other option...maybe...is IKEA. As hilarious as it would be to set up in the office section, I was thinking of the restaurant. I don't know if there's wifi but I'd be willing to pop over there and see if there is.
Starbucks across Bethlehem Pike from Whole Foods is pretty small, as is the one off of Ridge Pike in Conshy.