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I know this is suuuuppperrr late, but no one else has responded to this, so I'm just going to say, I know for sure that it's a lot harder than the diagram you posted, but I'm not exactly sure about coding or wiring or anything like that. Sorry. I hope your nephew gets better soon!
please dont bump EXTREMELY old post thanks
"Is there a way I can add a button on the back that is not a DUPLICATE of the the RT. When I press it the chip still thinks it is the RT. so It pulses the Pin 5 that is connected to Y - but in my case I would connect it to A?"I think that might work. but I have no experience with jitter.