Get a male H4 plug, and wire both pairs of wires in through that. When you get an HID conversion it will probably connect through the original H4 plug, so it seems a shame to cut that off just yet.
IMPORTANT: if you are connecting 2 bulbs on a bike which is only meant to have one, there is a risk of melting the switchgear, the wiring, or any of the connectors. Be careful, and ask if you aren't sure.
I guess your bike should have 1x55w bulb normally, 2x55w will likely be a problem but 2x35w should usually be OK.
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