Budget CX/Gravel Wheelset

DT Swiss G1800 tubeless can be had for under 300 if you shop around & I'm quite happy with them.

Not sure if your 3kg is such a problem though. I have the DT Swiss (1850g), Hutchinson Touareg 700-40 (900g) and 105 cassette (about 360g). Sealant and tubeless valves probably adds another 200g. I could save 3-400g by going for a much more expensive wheelset but not much scope for saving on gravel tires or the cassette. I don't see a way of getting a lower weight set up for a budget of 250 EUR

I'm ordering a Giant revolt at the moment. I've heard the sx2 wheelset might be the weak point in the bike.

Would these be much of an upgrade?