If you don't mind the rear wiper insert & ****, you can use an explorer bezel that has the 2 fog switch openings already (actually one is fog, one is rear defroster but they're the same size opening)
Or you could go crazy & mod either a Ranger or Expo bezel like I do:
That's my latest creation, the first ever 4x oem fog switch bezel. (I know 3 of them are defrost switches, that was just for mock up)
You'll need to do a little modding to the switch bracket on the back of the bezel to fit the 2nd fog switch in the defrost switch opening but it's nothing major.
The real trick to utilizing the 2nd fog switch is the wiring as Ford doesn't use a simple on/off style switch & they need to be converted to allow you to use them as a regular switch. Luckily I make a conversion kit that takes all the guesswork out & makes the install fairly simple.