I think the method listed in this post will work but ended up using the steps listed in another post:
https://ttlc.intuit.com/community/taxes/discussion/steps-to-take-to-remove-an-excess-salary-deferral...
They are the same steps as those listed by TurboTax in its built-in contextual instructions for "Steps to Take to Remove an Excess Salary Deferral".
The two methods seem to me have the same calculations and lead to the same federal/state return numbers.
