I would be already satisfied if they just gave Rapier classes to Scout Tree.
I think the Swordsman Tree should be what it is in their gamecode: the Warrior tree. Fencing is not for warring scenarios (as in, long battles against armies), it is made for fast, precise, clean duels and stealthy operations.
The only real use of Rapiers on warring scenarios are as ornament swords in military ceremonial events, which technically would fit if there was a sinergy with Templar, but well, it isn’t the case.