Shouldn't forget the Executor just because it's new. 2x High Intensity Laser + Gravitons + Squalls + HVDs in the front mounts should be plenty strong and beamspammy.
Ehh but it only has 500 flux dissipation and maxing vents only brings it up to 1000. Better to bring two champions.
With skills it is not so bad:
500 base
500 vents
50 + 50 Flux regulation
200 OP on weapons -> 400 with Ordinance Expertise
150 Flux Distributor
Total 1650 flux dissipation/second
2x HIL + 4 Graviton + 3 HVD = 1625 flux/second
So you are slightly overfluxed by shields (200/second). Technically Elite Energy Weapon Mastery and Stabilized Shields gets you to flux neutral. Finish off with say 2 Squalls, 3 Flak, 2 Burst PD, 2 LR PD Laser, so 199 weapon OP.
Spend 20 on Flux Distributor, 55 Vents, 15 OP on Stabilized Shields, 10 on Advanced Turret Gyros, 25 on Advance Optics, 25 on ITU, Expanded Missile Racks s-modded, ECCM s-modded (immunity to ECM range reduction/buff Squalls), 1 capacitor. If Best of the Best, s-mod Hardened shields. Seems like a reasonable long range (1800 on the beams) fire support battleship.
You're down 1 HVD compared to a pair of Champions, but up 4 Graviton beams and have better point defense. 200 more range with ITU, but slower speed at 50.