Congress is free to impeach any Supreme Court Justice who is misbehaving in office.
The idea of the legislative branch imposing on the judicial branch through a legal code of ethics violates the separation of government, and the independence of the judicial branch, for no good reason really.
If a Justice is misbehaving in office then impeach them. There's no reason to start interfering with the Supreme Court like this.
@Mjo321@mstdn.social