Im 99% sure that you can hold a EU licence from one country and do the DCPC in another country. Ill try to contact someone I know who has done this to confirm, but it may be a little while.
As a EU licence holder you can drive a vehicle from any other EU country. Thats one of the joys of being in the EU: qualifications are recognised across borders. Companies may be a little shy about doing this as they need to verify that the licence is valid,but I dont think there is anything in law to prevent this.