Happy Holidays!
My carbonda 505sl was 1020gr for an xl frame.It holds wel after many though gravel races.Concerning crux and it's low weight: that one easily breaks, a small crash and you end up with 2 pieces of frames. This is also a reason why you could opt for the 'heavier (Chinese) frames.
Durability is definitely a concern for me with gravel. I probably crash my gravel bike on yearly basis. Are Crux frames really that fragile? 200-300g extra on a Chinese gravel frame doesn't seem that much if it means better durability. Compared to steel/alloy/titanium, a reenforced 1-1.25kg carbon frameset is still quite lightweight.
https://www.pandapodium.cc/product/voicevelo-g-major-disc-brake-gravel-frameset/The Voicevelo G Major frameset is probably the lightest gravel frame from the Chinese domestic market. At $2099 USD though, you could probably find a non S-Works Crux if you shop around.