I've posted this before, but will add it again here just based on the Perfect Stealth Rig thread topic-
My "almost-perfect stealth rig" would use a 4 or 5 channel d:Vice > phone. Alas, such a device does not exist. The current d:Vice is 2ch only and it doesn't appear that two can be run simultaneously into a single phone, which would make for a non-perfect work-around anyway.
My "perfect stealth rig" would use a custom-built very small, single-purpose, multichannel recorder with mic powering built in. I would need to run some tests to confirm the number of channels I'd really require in my "perfect rig", but it would be somewhere between 5 and 8. I keep my eye on the DIY recorder threads here with this as a long-term goal.