Idea how to improve the Magyars

In the game, Magyars have very mediocre defense. Historically however, the Magyars/Hungarians were actually very good at defending their castles and had a lot of heroic siege defense moments.

The Hungarian castles ultimately stopped the Mongols, to quote from Wiki: none of the few Hungarian stone castles fell, even those deep behind the Mongol lines. When the Mongols tried to use their siege engines on the stone walls of the Croatian Fortress of Klis, they did absolutely no damage, and were repelled with heavy casualties. A similar thing happened when they attempted to capture the citadel of Esztergom, despite having overwhelming numerical superiority and 30 siege machines which they had just used to reduce the wooden towers of the city.

During the times of the Turk invasions that whole area became one huge fortified borderland and there were a lot of legendary battles like siege of Eger, siege of Szigetvár, siege of Güns...

Here are some of the legendary Hungarian castles: https://www.heritagedaily.com/2016/05/10-historic-hungarian-castles/111520

So it would be historically accurate to boost Magyar castles and defense late in the game. It would also balance them to become a very unique and tactically intriguing civ.

I think Magyars should get extra HP bonus for their castles in the imperial age, allow them to have fortified walls and boost their HP as well.

So basically, the Magyars would go from an aggressive early game civ to an ultra-defensive late game civ. Rush early and wall up late and win a trash war of attrition.

Do you think that would work without making them overpowered?