The West Lothian Question is a red herring: the Parliament of the United Kingdom may choose at any time to enact legislation effective in Scotland, Wales or Northern Ireland within policy areas currently devolved, and that legislation would prevail over any enacted by a devolved body. It simply chooses not to, just as it chooses not to add to, or subtract from, the devolved policy areas in any of the three cases. But it could, if it wanted to.
However, there is a real constitutional outrage, namely the Barnett Formula. Since we on the Left know and understand welfare and public services to be the entitlements of citizens as such, the Barnett Formula is an unconstitutional denial to the people of England of equal citizenship of the United Kingdom as guaranteed by the Treaties and Acts of Union. It simply has to go.
A very good start would be to restore free undergraduate tuition in England, and to pay for this by deducting the cost from the block grant to the Scottish Parliament.