Wait a sec...so hh's lossless files are sourced from lossy files? That being the case it's not a true representation of a lossless file. All it's doing , besides the obvious of holding up finalization of your project, is bloating the audio files even further with no added benefit of truly providing superior audio.

That being said, I would as others have mentioned go ahead with the authoring of your bd and releasing the mkv. I have watched 2.1 at home, and I do have a higher end system to listen on and my personal experience has been nothing short of phenomenal. Given that we are listening to lossy files as is, please bear in mind that they're higher bitrates than mp3's. just my 2 cents since I know you're anxious to move forward from this so you can give ESB and ROTJ more attention. :)