One of the reasons you don’t see the buttons out there is because nobody makes them. And if you can get a display frame, the plastic is old and fragile and will break easily if you don’t know what you’re doing. I’ve reconstructed many of these and used epoxy and other materials that work for the most part very well.
Those buttons are separate pieces and the pins on the main piece get melted to the button assembly. It would be nice to have the whole display available and be a new production piece.