I wouldn't recommend putting the 9007 bi-xenon bulb into the high beams. It's designed for a 9005 single filament bulb, and the beam pattern will be way off (lots of glare, not put light down the road, etc). Shifting the filaments even slightly can drastically change the beam pattern (the difference between 9007 low and high beam filaments is ~1/8 inch). I know you don't want to waste your bi-xenon kit, but you'll get more useful light output using the proper bulbs in the proper openings.
Dicslaimer: I've never tried this, but it theoretically should probably work the way you want (maybe).
If you want to do it, you'll probably need a relay harness for each bulb. Trying to run two bulbs off of the stock wiring will lead to melted wiring and fires. You can connect the trigger wires from both relay harnesses into the factory connector (splice the wiring from the connector on one harness into the other). As for running the low and high beams together, this thread from that other forum (*boo, hiss*) should explain how, as well as a copious amount of good information on HID's in general. It's seven pages long, but it's definitely worth reading if you want to do HID's properly.
To connect the halos:
Your turn signal (big orange bulb) has three wires going to it. The black wire is the ground. The brown wire is always on whenever the parking lights or headlights are on. The blue wire flashes with the turn signal. If you don't want your halos to flash with your turn signal, wire them into the black and brown wires.
Here's what the harness looks like (pic borrowed from another thread):
