DJK, thank you for your replies; as usual, you bring a wealth of detailed knowledge into the discussion.
I don't think there is any requirement here that plugs conform to any particular pattern, or be "UL listed."
Apart from the usual pattern we see on 'ordinary' plugs, most of us have a completely differrent 120v receptacle and plug on the power supply to our laptop computers; even desktop computers use a different pattern. Various industrial controls have proprietary plugs as well - even when the thing needs but ordinary 120v.
Therefore, I don't think there is any US code issue with using a Euro-style receptacle to accept a Euro-style plug- as long as the power available is appropriate for the device.
As I see it, the only code issue was the proposed method of deriving this 240v from two separate 120v branch circuits.
