Let me start by saying that I am not an electrical engineer. I looked at a buck converter to move 12 V down to five for my iPad. I took it over to a friend of mine who has an electronics lab with an elaborate Hewlett-Packard Noise and spectrum monitor. It was amazing how much noise the inexpensive buck converters produce in the radio spectrum that we use namely between 118 and 136 MHz. I looked at the specifications for the Molex adapter that you mentioned, and did not see anything about the electrical noise that it produces. A simple test would be to connect the Molex product to a battery and put a handheld radio next to it, and tune, through the aviation COM spectrum With the squelch turned down so that the receiver is continually admitting noise. You may be amazed at what you find when you bring it close to the USB plug. Just a word of caution before you spend a lot of time, installing it only to discover that you have an unwanted and unexpected noise in your radios.