This is an area that we hope to see grow, but there are some good options! Currently the best steel toed work boot that is also zero drop and has a wide toe box is the Birkenstock QS 700. The only thing is that you have to remove or replace the insole in order to make them zero drop.
For my full review of this barefoot friendly work boot plus addition options read this article on the Best Barefoot and Minimalist Safety Shoes on the Market.