My Hex Driver stripped internally and I came across https://printverygood.blogspot.com/2020/11/hex-bit-driver.html which was a down load for short stubby reversible Hex Bit driver. He did a nice job of the handle shape.

I used Meshmixer by Autodesk to modify the Handle and elongate it to suite my set. It fits perfectly and works very well. I also used FreeCAD to export the STL file as Meshmixer does a fine job but the file was very large. FreeCAD made the STL smaller for some reason but took ages to import.

I left the PVG - Prints Very Good Logo on the handle. Hope he is OK with that.