Also maybe it's possible to 3D print one?
I would have no idea how to do that and I imagine you would need one in order to 3D print one?
Yeah, you'd need someone with an original to make a model of it based on the original. I just realized you are talking about an R, and I have an RX so I'd guess it would be the same. If I remember right the switch is a pretty simple piece of plastic.
I have personally done only a little bit of 3D modeling but I know a couple people that do 3D model designs, so it might be easier for them. Next time I see them I could ask if they'd be willing to help if I pulled out my original switch. It would still cost you a bit for the filament and time to get it printed but it could work if you're willing to overlook the fact that it's not "original".