Oh, I thought it might have been simple for a moment there. Since im using 16F i only get 1 hardware UART to play with but im using a MAX485 chip and in the lights the PIC controls the master/slave pins (the 555 method is only used in the main controller). So i can send data to a second chip without it being sent outside the light. I also have 2 spare IO pins so if i use a PIC chip to controll it i can tell it to only listen for serial data if an input pin goes high.

Now i just have to think of something to do with all those extra IO pins on the second chip. I dont think you can get anything with less than 12 and A/E/USART