would this work? its a pretty sick show off kida idea...
Your horn is just another electrical signal, right? So, would you be able, say, to take your purge wiring, and in addition to haveing it wired to the purge button, have it wired to the wiring for the horn. Hence instead of pushing the button you can honk the horn to purge? Now i know that is stupid, but i was thinking of that in terms of friday night at a meet when you get our of your car to go into the store or something. You hit the lock button, if you have keyless entry, and one the horn goes "honk honk" the purge goes "pssss pssss".

