Creating external control application

Would it be possible to create an application that would let you change actors in the level while you are in game mode. Basically, I would like to create a system where you could create assets in the level that could be tagged with controls for items you want to swap. Whether its materials, static meshes, images in a material, ect. Similar to a car configuration app that wouldn’t have a touchscreen gui controls. In this external app you could save preset, or pages or elements, maybe and xml or Json feed that could update the engine in game mode.

Is this even possible? I know it would be a custom built app, but I’m more of an artist and don’t really know what is capable on the app end?

Look at osc - specifically touch osc - at the end of the UE4 OSC thread there’s a tutorial I made showing an iPad interface which I use to control stuff at runtime.