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.