Check whether the Freemake Video Converter can be of any help to you.
At this point in time, what all I know is that it can convert any video and burn it to a BD.
Download from here Freemake - Best Freeware Alternatives To Paid Video Software
and try it.
Your report on how well or otherwise it performed for your project may be of help to others. ( Use a BD-RE for the trial)
EDIT:Though I am averse to any conversion process that will change the original, out of curiosity I decided to try the conversion and burn to BD of the Freemake Video Converter.
To this end, I first converted a less than 25GB main video of a BD with DTS HD and DTS 3/2+1 audio plus English subtitles - which I already had as a BD ISO - to an mkv file using MakeMKV (MakeMKV - Make MKV from Blu-ray and DVD
). I opened this mkv file in the Freemake Video Converter,hit the To Bluray button and started the conversion & burning process. Its just click and keep watching. The conversion/burning process is on and here is the clip, where one can see the input file attributes and the BD content attributes. The only thing I can see is that DTS is now converted into AC3. Once the burning is over, I shall try to play it on my PS3 Slim and let all know. It shall be for others to scrutinise this screenshot and give their comments.