It sucks having to write your own stuff for basic functionality, but if you're a decent programmer you should be able to just eat the time loss and write a small wrapper for it yourself. Just write that button handling, get it working well and then make it so you never have to touch that part of the code again. Do that a few times and you'll be able to get to the meat of your funny little game.
Bonus points for finding an example implementation of said boilerplate in either Valve's SDK's or online in a documentation/unity forum/stack overflow. Not everything needs to be a spoonfed NuGet package when you're making a small hobby project. No investors or clients riding your ass about getting it done within a short time.