I'm not sure how important close proximity to the Domme is for you? (IE smell coming directly from her)

If that is not crucial you might want to look for Dommes offering heavy rubber and gas mask play. They often offer bubble bottle play (various liquids in the bottle create strong aromas) or, alternatively, I believe placing stuff in the filter space on the mask (very ripe socks, piss soaked panties, used wipes etc) can create a strong aroma.