I think the safe answer is to put in a 6-15r and then get a listed cord cap adapter or just put a 6-15p on it. Legally you could get away without a GFCI but this is not the spirit or intent of the code so I would get a 2 pole 15a GFCI breaker to serve this circuit. The thing I believe would be an issue is the voltage. If European appliances are expecting 220 volts the 240-250 we have here might be too much of a good thing. It would certainly get the tea hot pretty quick.
