Fairly newish. I think it's from 2005 or 2006. It's by Michael Avon Oeming and Scott Kolins. It also features one of the many fun Thor/Hercules fights in comicdom.
You're right about the plot device thing. Especially back in the '60s. Stan Lee had Mjolnir do literally whatever he wanted it to do for any given story. It makes reconciling those comics with later ones, where Thor's power set is more or less set in stone, very awkward.