As a general rule, basic prebuilt FG wheels are usually several hundred gms heavier than basic prebuilt road wheels. A lot of this differnce is explained by the front hub. Any road front hub is going to be more than 100 gms lighter than a typical high flange track front hub+track nuts. The other few hundred extra grams on the typical fg wheel are explained by cheapness.....plain gauge spokes, higher spoke count, and the tendency to use deeper heavier rims.

Reduce the spoke count, use butted spokes, use a road front hub, and a reasonably light rim and you'll have much lighter wheels.
In fact, because FG/SS wheels have symmetrical dish, the wheel is structurally more sound than a geared wheel and, in theory, you should be able to build with fewer spokes and lighter components than with road wheels.