I have started some preparations. It took some time to create and tweak to create DVD-RW with BR contents so that it is accepted by PS3 as AVCHD (or something like that). Here's summary:
1) Took BR image from https://hdcookbook.dev.java.net/servlets/ProjectDocumentList?folderID=0
2) Added BD-J stuff available at the same site.
3) Burnt the stuff as UDF 2.50 using Nero Linux (I am Linux user primarily and haven't yet found a way to do this from command line - I am still pretty lame in Linux).
At this point PS3 was still seeing the disc as DATA (on attempts to play .m2ts file from it or copy the whole disk the PS3 hanged up). Started to look around what the reason could be. I found something similar here:
The solution to similar issue is to replace Index.bdmv and Movieobject.bdmv with Nero ones available here: http://www.ps3news.com/forums/attach...chmentid=14569
This made the disk accepted by PS3 however it only plays one of the videos (there are 3 or 4) and I couldn't get to any menu or get BD-J to start. However I think with some tweaking (probably those 2 .bdmv files need to be re-created somehow - have to read some stuff on BR authoring) I will get it running as BR disk. Any suggestions are welcome.