You'll be fine in 15A mode for now.
I'm having my dad's old buddy (commercial electrician) come over next weekend to install another sole breaker for this Spaz also.
I'm a strong advocate for 20A operation but if it means not getting a Spaz because of this, DON'T let this hold you back - the Spaz is a great machine even in econo mode. It just makes you really appreciate 20A when you finally convert it.
I'm really glad you joined us, keep us posted on the arrival and everything.
Don't worry about customs, they'll release the machines by at least Mon-Tues, I think...sometimes they're slow and sometimes they surprise us.
Congrats again on your VII.
One more thing...
forgot to ask, did you get the 15A model or the 20A? either way you'll be OK to run it on full 20A with the regular plug on the Nema20 socket (I think).