Star Wipe transition between cameras?

In the game I’m working on, the player switches from character to character pretty often. I’m hoping to make this more interesting by having different types of transitions between the character cameras.

Most of the neat transitions for film involve both camera (youtube example).
How could I go about having both cameras play on the same viewport in UE4?

I tried my hand at using a render target, but I couldn’t get the colours to look right, or change the target resolution dynamically to match the viewport size.
Is there a better way of doing this?

Thanks :slight_smile: