If the OP's that concerned about flatulant odors he could always scrounge
around used building material yards and pick up an American Standard
"Ventaway" toilet. (AKA in my youth as "The fart catcher.")

Repair parts for them are still available.

They stopped making them quite a few years ago, probably for water
conservation reasons. They used running water to pull the air out
of the bowl and send that air down the drain after the trap section of
the toilet.

Airplanes toilet also suck air out of the bowl. However it is not continuous
action; you have to push a button when you need the wind (or whatever) suck
out of you.