If you're heading to Europe, you'll have plenty of opportunities for flat, shallow kitesurfing there (especially in The Nederlands).
I surfed a beach directly west of Rotterdam a couple years ago. When the tide was high, the bay was 3/4 mile across and consistantly 4-6 feet deep all
the way. Flat and calm. Such is the way of most beaches in The Nederlands.
If you want a little wave action, head down to France. All the way from Normandy to Brittany (and beyond) you'll find long straight beaches.
Also many kitesurf hotspots in the south (Tarrifa Spain, Beauduc, France etc.) and fresh lakes in the mountains (Silvaplana Switzerland and others in
Austria).
If you're looking, you wil find many opportunities to kitesurf in safe conditions. Some good schools too.