There is a font conversion BW font to Unicode font contained in the BW8 Help file, chapter 59. The macros are also included in unimacros.txt in the main BibleWorks program directory. You will have to copy the text of macros, then open the Word Macro editor and paste the macros into the Word Macro editor. Then run the macros.
We haven't had a lot of feedback on them, so make sure that you make a backup copy of your document before you run the macros. You can change the font names in the macro to convert directly to SBL Greek and SBL Hebrew, if you wish.