Makes sense. I did something similar, although on a smaller scale, for the documentary Rats. We had to steal some shots in Vietnam so I used recording transmitters in record only mode and I wore a recording transmitter with a DPA lav in a baseball cap for ambience. Listened off an ERX in my pocket with earbuds when wiring people up and would occasionally walk by talent while filming to make sure the mic still sounded good. Worked great! In the final product, you can tell the switch between the A7S that we shot on in Vietnam vs the Arri Mini we used for the rest of the film, but the sound is consistent throughout the film. Good stuff and it totally saved my bacon. We were supposed to be able to bring our whole sound and camera package but that fell through, so we had to scramble. We were flying in from Cambodia, so not chance of getting other gear. Luckily all my wireless was Zaxcom, so I just snuck in a few transmitters and an ERX into my carry on and was able to get on with it. Production was incredibly happy and grateful.