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ST-E3 RT + 600EX RT + 430EX II??

Hi all-

Just picked up a 600EX RT to go with the ST-E3 RT I had purchased earlier (I ran out of money hence getting the ST first). My question is: Can I mount the ST-E3 RT to my 5DIII and fire the 600EX RT via radio while having the 600 trigger the 430EX II optically?

My hope was to finally have the ability to do 2-light setups, but I can't seem to figure it out. Is there a workaround or should I sell the 430EX II and try to save up the cash to float another 600?

Thanks