It might sound revolutionary, but I think the times when Rheinland was weak and defeated are over. The big eighty ended in 669 A.S. and since this point of time, nearly 150 years passed. If we look at the German Empire, the nation recovered from WWI in only twenty years.
A new era has begun for Rheinland and we should not look back, but to the future. Currently Rheinland is in negotiations with the former enemies to get over the great war and create a common base for a wealthy future. The proud Kusari people aren't our enemies any more, but close partners, when it comes to economy and politics.
Like it has been already said, Battlecruisers are highly developed technological vessels, which break with the current capital shipline, which is more like 'big brick with big guns'. A more sophisticated shipline would be very good for Rheinland. Now we have already big ships with a huge armour and firepower, but nearly no highly advanced and quicker capital ships. This should be changed.