I use a software called Mixemergency to video dj. It’s basically a Serato plug in and is quite the most preferred solution for many djs.
I’m not sure what the demand is for a fully functional controller that can show videos on the dual screens.
Something like the Pioneer RZX but not locked to any particular software like Pioneer.
Imagine a Denon MCX8000 Prime with the many suggested fixes and the added bonus of doing videos with Mixemergency, Virtual DJ, Mixvibes and standalone too.
I will pay 2000 easy for such a device.