Your description of "the plan" is correct and what you say about I2C using the pins makes sence. I guess I need to figure out what pins the I2C needs to communicate. Do you think I could use the PB5 (reset) or would I have to make changes to the fuses to do that? How about the CLK1, or CLK0.
Do you know what pins I2C requires. Also, my limited understanding is that the attiny does not directly support I2C so the TinyWireS library creates a wrapper around USI in order to communicate. Does that mean that I am more concerned with what pins USI uses than I2C?