Even a top-tier manufacturer's costly, excellent product for application "A" may well be unsuited for application "B" when the two applications have conflicting technical requirements, as they clearly do in this case.
When condenser microphone capsules have only a 3 mm effective diameter, noise will be a fundamental problem even though the DPAs are at the highest level of quality I can imagine for such crazy design constraints. I'm a real admirer of the development work that they've done on these tiny critters. But the 4061 has a noise spec of 38 dB (CCIR qpk), which I would find unacceptable except for close miking of very loud sound sources for amplification purposes. Professional small-diaphragm condenser microphones used for recording, broadcast and film sound these days have noise levels ~15 dB lower, and the difference matters unless the program material never has any quiet parts whatsoever.
In short, I really think that the use of subminiature lavalier microphones for conventional (i.e. not very close-in) recording is a mistake unless they're absolutely needed for stealthing. If your microphone is as noisy as the 4061 is, the noise of a recorder's mike preamp can hardly be a problem worth considering, and you can surely dispense with any external preamp--as well as with 24-bit recording of a signal that can have only 12 to 14 bits of actual information if you're lucky.
If on the other hand this is all about stealth recording and I simply failed to pick up on that, I apologize. But even in that case an outboard mike preamplifier can't solve the problem of noise that's in the microphones themselves. Surely there must be better choices even if you need small, concealable microphones.
--best regards