Quick and easy would be a pair of Y harnesses, plug the single lead of one Y harness into one of the legs on the other. Would give you three legs to connect your lamps too, and another to plug into your pack. (if it has a Futaba end on it too)

Heck I just about finished wiring up the lamps in my Cessna 182. Six (6) landing lamps, red and green nav lamps on the wings, blinking red on the tail, and a strobe in the belly.
Toss in a pair of 555 timer boards to run the flasher and strobe, and you're talking TWENTY SIX (26) wires snaked all thru the plane and ending up at a single plug.[X(]

Still gotta set up a tx run switch for it and I'll be done. WHEW!