@TonyJoe: Thank you! You have it right, no ships for nomads until they leave their tech group. The overseas travel is not as much of a concern as the ability to fight off blockades though.
At least pirates don't care (much) about us, even though we have no way to fend them off.
Are you going to leave anyone alive that you can westernise on? Say one of the German minors as a vassal?