I have done that successfully a couple of time too. Here in Az if the car was sitting out in the desert chances are that plastic is so brittle it will shatter with just the tapping operation. Now that I understand that physically all these switches are the same it is possible to buy the cheaper C body switches and a bit of rewiring you can make them work perfectly. The '66 Valiant was a '65/'66 only switch that NOS was over $400... nope. NOS C Body switch for $90, open it up like you said and bit of rework on the contacts and it works just fine.