Unfortunately the current version of the dash button isn’t as easy to hack.
I had the same idea but when getting deeper to it i realized this Sorry for not having the links any longer. But please study a bit more before bying them
Maybe you find an easy solution - but as far as i know you have to frickle around with smd soldering to hack the new one.
I hope the IR solution of Michelango and IQaudio will work some day out of the box (which it appearently does only with the IQaudio hardware) - or i will learn the flirc thing…
Unfortunately i didn’t save the link because i’m no master in SMD soldering and after messing up a brandnew PI Zero W by trying to solder an UFL antenna connector recently i decided to not going on to frickle with the new dash button.
I tried to find the page again - but no luck.
I remember you have to remove a SMD chip to program it - but maybe there are better ways to hack it.