This morning I ordered this, it was $20 on Amazon. Got it this evening, it works exactly how I needed. The hardware is tiny, the capabilities are greater than a simple SD card reader (it provides wireless access to drop files off and pick them up from all iOS devices, so I’ll probably eventually be able to push files from my iPhone, pick them up on my iPad, and end up with a backup on the SD card plugged into this device).
Here is the link - my apologies if it dies at some point, it feels like all the links I found on the internet eventually died: https://www.amazon.com/gp/product/B00HZ ... UTF8&psc=1
For the record, the iOS app used to access the device is “HooToo TripMate Plus”. The hardware feels very solid and not sketchy, and the app, while definitely not an iOS native app, isn’t bad to use at all if you have a technical background. Currently, I’m able to use one of those recharable battery type things to power iPhone, iPad, and this HooToo device in the field, so it isn’t a problem that it requires power to run. I will try ordering one of the SD card reader type devices in the future, but ordered this one because I felt it had the best chances of working based on my internet research.
I was able to pull a WAV file directly off the SD card into LumaFusion without the file ever going anywhere else on my iPhone. Will continue to test and to report back.