If you only want to receive mail at aliases it's easy: just setup an email catch-all on your domain ;-) To send is another matter; and unfortunately, I haven't found a way to easily do this with fastmail.
FWIW, I switched my order to the stripped-down "angel" and did eventually receive it but it was non-working junk. Some sensors didn't work; others produced garbage for data. So disappointing.
I'm in the same boat. I backed the original Ubuntu Edge indiegogo campaign, but it never happened. And I would check the site periodically to see if there was a phone that shipped/worked in the States (and there never was) or if it was running on anything newer than a Nexus 5.
FirefoxOS phones were pretty much the same story. Limited hardware that wasn't available in the US market.
With both, it may not have been a lack of global interest; but a lack of interest in the limited markets they chose to release in.
Just to be clear, Google Fiber in Austin is more marketing than reality. A small area of town has it--most do not. And while the other players have now introduced fiber, their coverage is also limited to select neighborhoods.
So, I don't agree that it's nice for Austin. This removes the incentive for the other providers to continue expanding coverage, and the core of the city will likely be stuck on the old cable lines for much, much longer.