You should be able to mux the lossless audio from Harmy’s into this. That’s what I intend to do.
Yeah I could do that but wouldn’t the lossless tracks muxed to the BD video-stream result in a mkv to big to fit on a bd25?
Maybe. If you don’t want them all you may be able to squeeze just one or two on there or maybe all of them. I only muxed in the stereo track (I’m not set up for 5.1 currently) and I was under 25 GB. But I don’t bother burning things anyway, I’ve gone full file/streaming.