Two cross in the back, straight-pull steel spokes. 20 front and rear.

Origin8 makes something similar, slightly heftier, 28/24 spoke count and it costs a little less. Also branded as xero-lite.

CX-Ray Spokes.

Edit: you could adjust the front wheel lacing, but I don't know that all the work would justify the means. Say, going from a 3 cross to a 2 cross, you may shave off a handful of grams. Or radial, depending on the integrity of your hub, shave off a few more. Perhaps lacing in a low-flange road hub would help satisfy your weight loss goals.