Don't make either title the Universal title.

Once a year (like in Summer ppv ideally), the champion of each show face eachother in the main event, and the winner of that match becomes Universal Champion. The belt isn't defended, it's just their title until the next year. They wouldnt get to defend it the next year unless they were champion on a show again.

Huge bragging rights and props for the show that won it.

Just an idea...