Neets is a privately held Danish company that, although you haven’t heard of them, they are Scandinavia’s leading supplier of AV control systems. And, it plans to make a mark in the U.S. with its new QueBec III control system.
Integrated with an HDMI loop-through, the QueBec III uses that to know when you want to use the connected display or not and then can be programmed with macros to turn not he projector (to the right input), turn on the room lights, lower the screen, etc via three I/O ports, a 12-volt trigger, RS 232 control, IR and USB. And, it actually has two HDMI loop-throughs so you can connect two sources to it and it will handle switching (and switching the projector or LCDs inputs for you). Certainly it’s not seamless, but simple for sure.
We like this approach and think it’s something to consider for controlling hang-and-bang installs where you normally wouldn’t even install a control system. And, here are detailed specs.