lol, I've done that on previous cars actually. Leaves a nice drip on the driveway.
I wouldn't recommend a breather filter in the engine bay though as eventually they end up splattering little oil deposits all over the engine. I guess it its on the end of the tank though it'll be ok as that'll catch most of the oil, might actually give it a go. Would save trailing half a meter of hose across the TIP.
PhilW can you take a pic of your tank with the breather filter please mate