Lightweight Disc Hubs

This:

I'd imagine the availability of 24h front disc hubs is some kind of indicator as to whether its a viable disc spoke count.

FWIW my relatively long ACI spokes were ~6g each.

6 X 4 = 24

If it were me, for the sake of 24g I'd er on the side of caution. If weight was the primary consideration you wouldn't have started with discs.