chris,
if you just need a auto-start-BD, that will start you film straight away, that wouldn´t be so difficult to create.
1. export your HD-film as self-contained quicktime mov
2. create a BD-encoding-preset in compressor using H264 for blu-ray, 20-25MBit and NO 2-pass encoding and AC-3 dolby digital
3. encode your assets
4. start encore CS4, create a new project with h264 and dolby settings and import the assets (that could take a while)
5. create a new timeline by clrl-klick on the projects-tab and drag/drop your assets into it. set your chapter-points in the timeline.
6. klick on the DISK-symbol in the flow-chart-tab and select your timeline as first-play within your properties-tab
7. go to built-tab, select format blu-ray, and output blu-ray-folder, set destination and create your disk.
8. press built-button
that was the quick overview what to do. now it´s up to you.
cheers
danny