In theory, all the assets are indexed by a number in addition to the ticker, so couldn't you just have the clients display a different symbol based on the localization or preference? It would be a very simple thing to make a user-definable preference for displaying BitGLD or BitXAU, albeit probably not very high on the list of priorities for development.
I realize that the downside is the potential confusion going forward created by two tickers referring to the same asset; however, you have to weigh that against the confusion of arguably the largest market for bitGLD/XAU being initially confused by an unfamiliar ticker.
IMHO, for marketing purposes, the two symbol solution would be an acceptable tradeoff.