The Fairphone 4 did eventually make it to the US, so I'm hopeful that we'll eventually get the 5 too. According to GSMArena it already supports the necessary LTE/5G bands for my US network.
Looks like it has all the necessary bands for Australian networks, too, so this seems like a licensing/distribution issue more than a technical issue. I really hope they release globally at some point. I will consider importing one if I can find it at a good price.