This app should also work on the April patch that was supposed to make remapping the Bixby button impossible.
Unlike some other Bixby Button Remapping apps, this one doesn't actually monitor keypresses. Rather, it detects when the Hello Bixby app is on screen and instantly kills it and triggers whatever action you set within the app instead.
That also means that this Bixby Remapping app doesn't result in a huge performance decrease like some other apps.
This app is somewhat experimental, so send me an email at [email protected] if you experience any issues!