There is a fair amount of assumption in there. Two hander swords weren't the sole provence of big, muscle-bound thugs. I would suggest you take a look at http://www.thearma.org/about.htm as they have a nice collection of essays about the use of the Longsword. Men who could wield the "Zweihander" (that is a modern term for the truly LONG swords used in Europe) where paid twice the amount of a normal solder because they had to both unusually strong AND unusually good. The reason for the latter is improper form can throw you off balance no mater how strong you are.
Also, if you study Martial culture, they believed skill in one weapon transferred easily to another. Filipino Martial Arts believe learning to fight with a stick will teach you to fight with a blade, or even with no weapon at all. Masters of Arms in Europe said that if you could use the longsword, you could use the side sword, axe, or even a pole arm.
The biggest thing though is that a Shardblade wont work the same as a normal sword, even if it's the same size. So I'm not convinced that they would tailor the swords so much.