As funny as it is, it is probably a good idea.

Perhaps, better yet, a cylindrical filter could be fitted into one's anus and changed everytime after taking a $hit.  The filters would have special chemicals inside them so the fart would smeel more like what's inside the filter.  The butt filters would come in different "flavors".  You might have incense, orchid, apple, sea salt, pinewood, peppermint, spearmint, and cinnamon to name just a few varieties of the many "flavors" available.  These filters would have to be made of biodegradable material so they could be flushed down the toilet safely.

By the way, Mr. Methane claims to be equipped with a catalytic converter.  Man that guy is extremely funny.  I love it when he treats his crotch with talcum powder before executing a long fart because then you can see the powder disperse in the air as he farts.