I guess you are doing this as a hack. If you are shopping the Digibee this is a fine time to get support from them. Ask them how to do this. If it's not possible they'll tell you.
I have 5D mark III and 600ex rt, I want to buy the Digibee to start a small portrait photography lighting. I will buy Westcott Rapid Box, (x2 the umbrella and the square one) along with it.
How can I trigger the 600ex RT and the Digibee at the same time? Should I buy pocketwizard? or should I buy the cybersync trigger for Digibee? in that case would it work with the 600 ex?
OR is it better to buy another 600 ex rt and use 2 of those?
I am new to lighting and I am so confused. Please give me some advice. Thank you ahead.