I think you are going to find quite a few loopholes. In my country, in theory, you don’t pay tax unless you convert bitcoin into fiat, but researching the subject I’ve seen some lawyers defending that when you buy something directly with bitcoin you should also pay tax because it is a way of cashing it in. Anyway, there is no clear legislation about it, at least in my country, but what is sure is that if you pay directly with bitcoins, especially to foreign companies, it is very unlikely that the IRS or equivalent of your country are going to be able to charge you.
In my country there isn't any law regarding bitcoins whatsoever and i doubt there is going to be a law in that regards for a long time. I want to know if the government in your country charges tax when people convert their gold in cash. If that's the case i think they should but if not then it's not fair because they are both likely the same asset.