Also G (uppercase) doesn't have units that result in G$ being a plausible quantity even if you could combine number-unit quantities and use like a unit like tha

Also G (uppercase) doesn't have units that result in G$ being a plausible quantity even if you could combine number-unit quantities and use like a unit like that (which you can't for this exact reason): dollar-cubic metres per kilo per second per second. It's also rather small.