well if only these pins have fallen it wouldn't be much of a problem, but you will have to use the internal oscillator for clock generation, problem will be UART at high speed, you may need some precision there and the internal RC wont give it, it depends of what you understand as high speed.
PA14 no idea because didn't give us the package you are using but normally there are several USART(g431 has 3)you can use, depends again of the layout of your board.