your already doing Ohana, and it sounds like you really dont want to do another one, so I wouldnt bother in your case. But Cape May has different characters than Ohana. CM has donald, minnie, and goofy (in beach wear!). I looove cape may. The atmosphere, the food, and the fact that its low key and not rowdy is pretty darn amazing. I highly recommend it.
honestly, since your planning it for a HS or Epcot day, its on your route as it is, so I say go for it.