Well, I'm not entirely familiar with the blower switches, have never used them and the entire idea of it doesn't seem worth doing altogether. But it's just my personal opinion and it has nothing to do with your wiring question.
Now, from reading the Seymour blog it seems to me that the blower switch is a switch that connects one of the pickups directly to the output, bypassing everything else. If that's what you'd like to do then connect a humbucker (most likely the bridge) hot wire to the blower switch (blue wire x on the picture on the Seymour website) and then run it to the your 3 way switch as you normally would. Wire the 3 way switch, volume and tone pots the way you would without the blower. Now the output wire that you would normally connect to the output jack, run it to the blower switch. From there run it to the output jack. This way whatever settings you have (volume, tone, pickup selection) are unaffected when you activate the blower switch (which will be direct connection of your bridge pickup to the output) and you can switch back when you deactivate the blower. Yeah, and don't forget to jump the remaining 2 terminals on the swith.
Then add a kill switch if desired (connecting the tip and ring connectors of the output jack through the switch like in the premierguitar article. As this will effectively just connect the output to the ground you don't even need to use shielded wire).
If you put the blower switch between the 3 way switch and the volume pot, you bypass just the volume pot, but what's the point then?
Hope this helps.
