I personally have no problem with a split Europeans with 1/2 the races in the UK and half on the mainland, as you say it may give more people the incentive to travel.
The main thing at this stage is to find out how many boats are interested and would be prepared to travel, whether it be held over here, in Holland or both, so yes please contact any potentially interested parties, and get their opinions/interest
Perhaps the UK sailors could indicate their level of interest in a split event or travelling to Holland.