You've just described the LF mkIIs, Hack. And I agree with the idea. We need to give LFs SOMETHING so that they aren't just smaller underpowered VHFs.
If this were to go through, I would argue for ALL LF mkIIs to be "interceptors". Give them dual thrusters and a slightly higher cruise speed, so they can catch up to fleeing ships whether they're fleeing at thruster or cruise.