Where to swap BTC to ETH without heavy KYC?

Hi! Using my regular exchange for this but the fees are genuinely awful. Swapped around $6k worth last week and the amount I received didn't match what was quoted at all, between the spread and whatever else they charge it added up fast.

Has to be a better way to do this. Anyone found a non-custodial option with decent rates where you just swap directly wallet to wallet? Would love to know what people up here are actually using.