Of all the options, the wired Lightning to 30-pin adapter (as opposed to the one piece plastic adapter) seems like the best bet but I'm wondering whether both components of the old CCK work with it properly (the USB connector and the SD card connector). In the Lightning series, Apple split up these two into two separate adapters.
I'm also wondering if using this adapter will add latency to MIDI and audio. Maybe the straight Lightning to USB adapter might be better?
TIA for any experience with these.