You can get a new Roadster in the States - MMC ships them to Morgan West without an engine and they then fit - think its a Mustang unit - this must allow them to bypass the rules.
http://robbreport.com/automobiles/return-roadster-0Womder why they can't do it with the Aero? - might be worth asking someone at MMC.
Also nice 2010 SS on the Morgan West website.