If they are ok not being curve objects anymore, you could convert them to a mesh, and try varying degrees of remove doubles or remesh, then when you have a nice simplified version, bevel or add a bevel modifier.

If they are ok not being curve objects anymore, you could convert them to a mesh, and try varying degrees of remove doubles or remesh, then when you have a nice simplified version, bevel or add a bevel modifier.

Converting a Text Object, Remeshing and Beveling