I built my own wheels recently for similar reasons. Wanted to build them around a set of DT Swiss 240’s but the hub prices new were frightening. Managed to find a second hand wheelset for cheap, so bought it, stripped the rims, sold them & was left with the hubs for £100.
Ended up with Flow’s (sadly I couldn’t find anything more suitable) and DT Revolution spokes. Including my ghetto tubeless setup (electric tape & Mavic UST valves) they came out at a gnat’s boll*ck over 1700g.
Saved a good chunk over the default choice of Pro 2/Flow & were cheaper too.
However, at nearly £600 to build new, its an expensive way to save 200g!