Popocatapetl said:

I created a working Blu-Ray from the MKV using tsMuxeR. It just remuxes all the streams and creates the Blu-Ray file structure.

If you can live without a custom menu, this is a great solution.

I was going to try this for kicks, just to see if it'd work, but get a "matroska parse error: invalid h264 NAL unit size. NAL unit truncated" error :(

Will wait for the "real deal" in any case... Just wanted to see if there was a quick way to burn for playback on a standalone player. Ah well.