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Websites and websites, I want bitcoin symbol in my text files, dammit!
Ok, so use a working text editor/viewer... Unicode's only been around for well over a decade now.
Picture is worth a thousand words (should be mentioned, no problems with for ฿ and Ƀ):

What you propose is an interesting hack, not a reliable solution. It creates more problems than is trying to fix. If it works on your machine, it's an exception, not the rule. But maybe there is an opportunity for you among The Bitcoin Corp gang, in hardware division, selling certified bitcoin machines capable of displaying the symbol properly.
Also,
I am now on a completely different computer than yesterday. Your B-Box now shows up as a B with two feet.
I have also had a look at your B-Box via Chrome on a GNex with Jelly Bean. Your B-Box there shows up as a B. Just a B.
Doesn't work for me. Ubuntu 12.04 32bit with Firefox, fresh install as of today, and most of these fonts are a b-box, except for ฿ and Ƀ.