Joey, the dual vents will work anytime there is air moving. And that means even when there's just a breeze and you're not moving. Getting an odor from the "input" isn't a consideration--neither vent should be where you plan to sniff it.
I know I've seen the 12V air pumps available, no idea where offhand. From everything I've heard, including Peggy Hall "The Head Queen", ex-owner of Peal Products, now part of Raritan, one good vent is all you need, two is already more than enough. There' s no need for air pumps unless you've got a troop of cub scouts with the runs onboard. Using decent size vent lines, keeping them short, making sure the vent screens aren't plugged, is all you should need.
The easiest and most reliable way to supply a continuous source or oxygen to an aquarium in an emergency situation is to use a portable 12 volt battery operated aeration pump system like the KeepAlive Oxygen Infusors™. On the Bass-Pro Shops site, type the keyword aerators into the "Site Search" box to get a list of these products they have available. You can buy these types of compact live bait well aerators that run on regular or 12 volt batteries at most fishing and sporting good stores or departments."
for some of the bait aerators. Remember, they don't have to run 24x7, you just need to "give it a shot of air" once in a while if you want to use a pump.