emonBase and RTC, real time clock DS3231 and RFM69Pi

I need to add the DS3231 or similar to the emonBase with the RFM69Pi.  I have googled and searched the forums but have not found anything.  Is it possible to piggyback these devices?  I can get the 3.3V DC from somewhere else if that is a problem and from my understanding the I2C won't be a problem but what about the GPIO_GCLK?  I apologize if I've missed this information in my searching.

Thanks,

David