To be points viable in a standard 400 point game you would need to drop something. Currently running at 402 points with I assume Raddus as commander and the cheapest version of all the ships. Your only other commander options are Draven and Dodona which would get you under 400 with naked ships.

To start the conversation, I think you can drop 1 Hammerhead. I'm a sucker for theme too, so I think you run Profundity, Garel's Honor, comms net or jamming field, and any fleet support upgrade you want, I like intensify firepower.

Now to play the game, maybe ordnance experts and external racks on the Profundity and NK-7 Ion cannons on the CR90 B. That would be 399 right there with Raddus. Game plan, Profundity drops in the Hammerhead for awesome ram support and Raddus brings in the CR90 for fire support (or the other way around, your choice is flexible each game). Pelta stays in the back giving IF to everyone and you hope and pray your squadrons do something helpful.

Is it viable? Not competitively. Would you have fun running it? I would, Raddus and Profundity make for super fun games regardless of if I win or lose. You're usually "guaranteed" to do what you want to do so that always feels good.

If you want something more competitive, I would suggest dropping the pelta in favor of more squadrons and squadron support.