Riva:
I cannot find a link but there is an ArduinoISP programmer out there somewhere that produces a 8Mhz clock output on a pin for programming without the need of a crystal. I also seem to remember being told/reading that it will also work with programming an 16Mhz as the MPU is just looking for an external clock.
That's the adafruit version of ArduinoISP: GitHub - adafruit/ArduinoISP: A fork of the ArduinoISP that has 8mhz output clock
You hook Pin 9 to the XTL1 pin of the target processor (that's the 9th pin down the left side if the end with the dot/notch is pointed up). This forces an 8 MHz clock into the timing circuitry to replace the missing crystal/resonator.