Kind of funny, but you should know that DCA isn't just a strategy designed for Bitcoin investment alone. You can use it for any other type/form of investment. And mind you, you are using dollar to purchase your satoshi, and not the other way round.
And again, the dollar is globally used for international trades, just like a standard unit of measurement or something, which means that the fiat currency of your country is still valued against the dollar, even for Bitcoin DCA purposes.
Yeah, it's dollar cost averaging, but it's now widely used, and the method is not only used when we buy anything with a certain amount of dollars and during a certain period; it's also being implemented and used even when we buy with other currencies. The "D" stands for dollar, but the range in which the DCA method is being used is far beyond just with dollars.