Interesting development here would appear that Sekonic have made a radio module for their DR meters that allows you to use the AC3 and flextt5/minitt1.
Using the flash in manual mode you can now properly meter adjustments made on camera with the AC3.
For me the most exciting element involves integration with the power ST4 on my ranger pack. Really hoping that this therefore impacts on the ability to use HSS and get meter readings appropriate to the “tail” of the flash.
I have been contacted today by sekonic/PW USA and hope to have more info for you soon!