The minor currency in Bhutan is called the chhertum which means they may already use BTC for this internally. They have every right to.
Bitcoin is a global currency, which is what the X-codes are for. So XBT is the best choice, as the XBC has been used by the European central bank.
BTC is fine for informal use, just as many computer systems hold YEN instead of JPY. Not having an ISO code is a monumental handicap for Bitcoin.
Thank you for contributing to this thread. I liked yours a lot!

As for the argument people are making to making a symbol for the ISO will somehow:
- harm bitcoin
- subject it to government reptilian control
- ruin their domain naming scheme
All I can say is, KRW is never referred to here in Korea as KRW-- it's called WON and the only time you see KRW is when dealing with transactions to other countries, their currencies, etc.
ISO 4217 is a reference table for everyone to know what something is called when they're talking about it so that they are all on the page and can have confidence that it won't be misunderstood. Any argument against making things simpler for everyone in the world is one of cultist paranoia, and the person arguing so might as well extend their argument to speaking in tongues throughout their work day. Afterall, who cares if anyone understands a single word you're saying? Standards are for pussies! From this moment on, all the words I use in the standardized English language will have new made-up meanings by me, because bitcoin.