If I get an A-box I could also have adapters made to input into different camera types. I am thinking about getting an A-box for the mini with adapter cabling for the new Red camera DSMC2 body type. That would cover the two main culprits for about $400. Not cheap, but maybe I could get a rental, hardy har har.
One of my biggest concerns is precedent. Though I am already running into many a lacking camera package, AC's that do not bring cabling or uncommunicative productions that will not answer my camera audio interfacing questions, I wonder if I am not doing a disservice to other sound operators by supporting an undue expectation that they should have gear in their kits that should come with the camera. That is why I am viewing this as a possible rental item: it would say YES I am prepared for your production and this level of preparedness is worth something.