under 2e, there was an item called an elven bow, which you could use for just that effect. Maybe a darkwood bow would work.
As for it being easy to hit a bowstring, it is an attended object. Sure, if the bow is just sitting in the corner, it is a large taught string. Pircing or bludgening attacks probably have a lot of problems, but a sword doesn't. The problem is that when a person is using an object, you can't affect that object without an opposed roll. Even spells I cast at your equipment don't ignore your saves.
As for it being easy to hit a bowstring, it is an attended object. Sure, if the bow is just sitting in the corner, it is a large taught string. Pircing or bludgening attacks probably have a lot of problems, but a sword doesn't. The problem is that when a person is using an object, you can't affect that object without an opposed roll. Even spells I cast at your equipment don't ignore your saves.