RE: Power Problems
You still have reduncancy in switchs/batterys by using a Y to plug the two and then into a RX.
What you have done is add an additional component ( the Y) between the battery(s) and the Rx. There is the added possibility of Y failure but that is not huge unless you use excessive length of wiring and or to light a gauge wire on the Y. My preferance if you wanted to do this is solder up my own Y to make sure the minimum wire run and sufficient wire gauge was used.
Actually I have done something similar. The airplane is actually a Seniorita that flys as both a Twin engine and a glider. The battery is positioned in the very tip of the nose or clear back under the stabilizer depending on the configuration of the airplane. A permanent Y is installed to the nose and under the tail of course it is of appropriate gauge and custom soldered. Been working well now for I think about eight years as a hard working twin and aerotow trainer.
John