Well, if you drop Centauri beams to just 2 or 3 AD Precise and range 8-15, I think you could accomplish making the beams the secondaries.
For the Magnus, for example:
Battle Laser 8 F 2 Beam, Precise
Ion Cannon 15 F 12 TL, AP
Ion Cannon 15 A 6 TL, AP
Ion Cannon 15 P 6 TL, AP
Ion Cannon 15 S 6 TL, AP
Or the Dargan:
Battle Laser 8 F 3 Beam, Precise
Matter Cannon 18 F 8 AP, DD
Ion Cannon 15 F 12 TL, AP
Ion Cannon 15 P 10 TL, AP
Ion Cannon 15 S 10 TL, AP
Liati:
Advanced Battle Laser 12 F 3 B, DD, P
Plasma Accelerator 18 F 10 Accurate, SAP
Ion Cannon 15 T 10 TL, AP
What do you think?