It’s an interesting idea, but the caveat here will be to do this for all currencies in the world, otherwise the concept of foreign exchange rates would get fucked up.
One of the primary parameters for determining exchange rate between two currencies is to first determine how much the same service/product/lifestyle cost in those two currencies.
Unless you “adjust” both the currencies (and in turn, all the currencies in the world), one currency (or country) would spiral into an economic abyss.