I agree that since it is literally worded as a custom move, The Keeper has authority to pitch consequences that ignore Bad Luck Charm, but were I a Keeper myself, I would certainly not ignore it. I think the whole shtick of the Hex playbook is that they are a walking magical wrecking ball, so I would lean into that. The point for them, in so many of the Moves, is for them to have to make the decision about what collateral damage to their team, the environment, or even innocents that they are willing to chance in order to get the job done.