All players are BD-J enabled - support is mandatory. The problems you have are what versions of the SDK and Java Runtimes to use that will make the disc fully compatible as I believe from memory the spec says version 1.5 - this may be inaccurate though.
Just about all online help has disappeared as if it were never there. The HD Cookbook site is long gone although you may be able to find a copy of the book.
Deconstructing discs is problematic too, as most producers will do exactly what we do & obfuscate the BD-J code (I cannot help as we only do music titles & film titles, not games).
I honestly wish you all the luck in the world however - this is going to take a serious investment in time. It took us 3 years of hard work just to get our Blu-ray Audio BD-J code stable and working well on all players and we had many moments of heartbreak & distress along the way too.
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