Don, to my opinion both Vegas and Vegas Moviestudio generate Profile 5 3D-BDs, but without menus. But I agree with you that the more professional solutions with both higher data rates and menu capabilities are still terrible expensive. If they will come somewhere in the future in affordable NLEs and/or authoring tools - well I do not know.
If you wish to use Vegas Moviestudio to generate the 3D-BD from Edius, I would export L and R as separte file and import that in Vegas again - pair it to a 3D project and render that to the 3D-BD. Can be as AVC oder Sony-YUV or even uncompressed. You could also use the Canopus HQ-codec, but here you have to take care that the liminance range is fine. Or one could use the Canopus HQX codec - that allows the full-side-by-side export in one file, but again you have the liminance issue here. The luminance issue has been described in the Edius 6.5 thread.