U+20BF is now official. It's just a matter of time before the font maintainers put it in their fonts. I'm guessing very soon.

Unicode 9.0 will be released in June, so you probably won't see official fonts released before then. If you just want a font to play around with, luke-jr has made a font with the Bitcoin symbol in its official place here: https://www.reddit.com/r/Bitcoin/comments/3refb4/btc_symbol_added_to_droid_and_console_fonts/

In any case, thank you to the bitcointalk.org participants who helped me with the proposal - the original thread is here if you're curious: https://bitcointalk.org/index.php?topic=1170902

Ken