Multi-currency operation

Multi-currency operation

We have just setup a facility to do transactions in Euros as well as our base currency of GBP. Now I want to set up our European customers to use Euros. I understand that I can't change the currency settings for customers who have already used GBP and I will have to set up new renamed EUR accounts for them. 

My question is - is there some way to clone contacts, and then rename them and change currency? Or will I have to re-enter all the details manually?