If we leave the allure of modeling out of the equation, aviation uses twin engine planes to provide power plant redundancy and provide the ability to carry more weight. Modeling breaks away from manned aviation in trying to capture the visuals of artistic airframes, often eliminating the otherwise required redundancy factors in the process.

Your goal can most certainly be done, without much difficulty. As for advisability, it's an area only the owner can make the call on. If the set up meets the predetermined requirements, it fills the need. If you can't find Wye harnesses with the required connectors on the right ends it would be simple to make them yourself. Simply buy a connector kit and make them up. Only takes a few minutes. West Mountain Radio (ads in the model magazines) and AirWild sell extension kits, as would any decent electrical supply store