I think this is what the Hunchback was made for. Yes, a simple AC-20 gets out-ranged pretty easily, but that's why you've got it on bodyguard duty.
The purpose of the bodyguard is to force the opponent into making a choice. The more choices he has to make, the higher the chance that he makes the wrong one. Suppose you have a basic fire lance, with an Archer, a Crusader, and a Longbow (I know you're asking for 3050+, but I know 3025 better). If you with something else long-ranged, like the earlier mention of a Hollander, then your opponent's choice is easy. All your mechs are built for long range firepower. The answer is simple -- close with them. That's virtually always the right thing to do. But if you've got something with a lot of close up firepower (like a Hunchback), then he's got to make a decision. Stay at range and you avoid that big nasty AC-20, but then everyone else can bring their guns to bear. Get close and the LRMs lose out, but now you're in close combat with the Mike Tyson of Battlemechs.
He'll have to make a choice, and he'll have to do it while under pressure. There's a 50/50 chance he'll make the wrong decision. That's much better than having an extra LRM launcher, or a single Gauss Rifle.