Yeah, my general concept is to incorporate the guts of several d:vices along with a battery to power them into a single external USB battery case. Multiple mics terminated to a USB style plug into a secondary converted USB port on the external. Phone + "external USB battery" = easy in.. even with my crazy 6 to 8 channel surround arrays.
A dream tantalizingly just out of reach. A micro PC that can pass as a phone seems a further reach to me, but I'd love to be wrong about that.