An idea to save the Voting Rights Act

The Supreme Court has invalidated Section 4 of the Voting Rights Act. That provision sets forth a formula for determining what jurisdictions must get "preclearance" from the Department of Justice to change voting practices (even trivial things such as the location of a polling place).

Technically the Court just said that the Congressional formula is no longer "appropriate legislation" given the changes that have occurred since the Voting Rights Act was passed in 1964. So Congress could theoretically fix the provision by coming up with an up-to-date formula. But many think that's likely to be impossible given the political realities in Congress. The main reason they kept approving the old formula was that it was political poison to get into the weeds of renegotiating the formula. So the provision is fixable in theory but dead in fact.

But what if Congress just passed a law that delegated the responsibility to come up with a good formula to some federal agency? They could even say the formula has to be revisited and revised every year, or whatever, thus ensuring that it would always be up to date. This would bypass many of the political obstacles to getting the provision fixed, and it would also meet the Court's argument that the provision was based on antiquated factors.

There are probably big problems with this idea, and I'm certainly no expert on the Voting Rights Act or the unconstitutional delegation doctrine, but I thought I'd just throw it out there for discussion.