I've finished the beta version of the SRT to ASS 3D converter, and I have tried to release BD3D2MK3D v0.86, but unfortunately currently I can't log in to my FTP account at VideoHelp. I hope that the problem will be solved soon, and I'll release v0.86 officially as soon as possible.
In the meantime, you can download BD3D2MK3D v0.86
here. (That URL will be valid only during one week.)
There are still some things to improve in the SRT to ASS 3D converter, but it is already usable. See the help in the menu for an explanation on how to use it. Suggestions, bug reports and comments are welcome. Have fun!