They say that the main reason that large-diaphragm condenser microphones sound warmer than small-diaphragm microphones is that they become more omnidirectional at lower frequencies.
I hadn't noticed before, but cigar mics are less sensitive at low frequencies. I guess they have to be, to achieve good directivity. That explains their cold sound.
I'm pretty sure you could emulate these properties with an array of MEMS microphones and some DSP.