Question: is the Vin of 3.4V for the Omages a major concern? I liked the middle-sized converter but this is also the only with the Vout out of range (for both 5V and 12V Vin).
Seems powering the Omega2 with stablized 3.4V shouldn't be a problem - I just checked the Mediatek MT7688 datasheet to find (on page 32) under "Absolute Maximum Ratings" for I/O supply voltage 3.63V. I should add, since Onion hasn't published yet the schematic of the Omega2 or 2+, we don't have much idea of what lies between the Omega's V3.3 power-in pin and the MT7688 under the metal RF shield ... my guess is not much, other than a direct line to the MT7688 power-in pins.
Thanks for reporting your tests with these inexpensive small power supplies!