Well, after brainstorming with my brother, and more importantly, getting some tips from ludeboom, I now know what must be done. First, those inner bulbs on the JDM light can't be used as high beams, they're just not powerful enough, they are actually meant to be "city lights", which would normally come on in the "standby" position where normally our corners just come on. What I must do is splice the corner lamp wire and lead a wire from the corner lamp power wire to the inside JDM bulb, so that when I turn my standbys on, the inner light and the corner light will both come on. As for the outer bulbs only having 2 wires out of the socket, I figured out that the person who sold me the lights, or someone before that, must've tampered with the housing, because there should've been at least 3 wires coming from the outer bulb plug. How do I know? Well, after my trip to South Africa to visit family, my uncle who imports cars from japan gave me one JDM headlight (yes, pretty useless, but I can always try and get another one to make a pair) which a customer who banged up one side of his prelude never came to get. What I SHOULD'VE done before I took the bumper off, was figure out how I was going to wire these things up. Sure enough, there are three wires coming from the outer jDM bulb on the headlight that I brough from SA, which my uncle had shipped to him from his connection in Japan. Of those three wires, one is a ground, one is low beam, and one is high beam, in a matter of speaking. To wire it to a USDM harness, I just need to take the wire that normally goes to the inside of the USDM light and solder it to one of the positive wires coming out of the outer JDM bulb. Then take the low beam wire that normally fit in the outer bulb on the USDM housing, and solder that onto the other positive wire in the outer JDM bulb. So now, what happens is when I turn the headlights on, the dual-filament will come on low, and when I select high beams, twice the amount of power is being sent into that bulb, triggering the extra filament, and now I have highbeams.
I was hoping that I could wire it up so when I just used regular lows, only the outer light would come on, but seeing how low beams is one step after standby, both the outer and inners will be on at that point.
One thing I'm not so sure about is the power-load that the corner lamp wire can carry. Before, that wire was only powering the small bulb in the corner lamp, but now it'll be powering the corner and the inner bulb, which is slightly larger than it, using at least twice as much power. If the wire can handle it, that's fine but what I'd like to avoid is an electrical fire Never thought someone could write so much about a seemingly simply headlight conversion, huh?