Easiest would be to either demux the mkv, or just load external subtitles and switch to those.
But if it's really BDMVs you want, you can go here: http://www.shareraw.com/
Hi, I hope you are doing well. A few months ago, I asked you about https://vndb.org/v10834 and you said you have the file + all updates/tokuten/dlc, but you were busy cataloging existing data. If you are free now, will you kindly upload this?