So, basically Large-sized Anti-HAW? I like that a lot better than the idea of dedicated battleship platform with XL weapons that keeps popping up.
I wouldn’t rely on short range or low tracking though, I’d go the route that CCP went with capital neuts: add a sig radius modifier that greatly reduces the damage to anything with a sig radius smaller than a capital ship. That gives you a lot more room to play around with tracking and range while still keeping them firmly in the realm of “anti-capital-only” weapon.
Could a BS fleet fitted with these guns be used in place of an equivalent dread fleet for structure bashing? Sure, except that they’d have a fraction of the EHP and active tank potential, so they’d be doing so from a much more vulnerable position.