How about?
Every port spawns 2 fleets.
One carrier fleet with the standard prefix C.
Add a second Invasion fleet, with the prefix I.
The CV fleet can remain as it is.
The Invasion fleet would use a BB instead of the CV.
Also several LSD's, landing ship DOCK, as seagoing VH's
Everything would spawn from the LSD welldeck.
An ability to stop the fleet, would be needed for this operation.
Including LCT, Landing Craft Tank, which could hold 6 tanks.
The tanks could use their mainguns from the LCT.
An LST was not designed to beach while under fire. LCT's were!
Some spawn adjustments would be needed, to allow players
to spawn their GV's inside their teammate's LCT.
So he could carry them to the beach, while they provide
the gunpower to fight their way in.
If a BB is to be added, BB class shore batteries should be added.
There were many different forms, 12 14 15" take your pick.
I favor the Sevastopol BB turret style, because of the 360deg traverse.
The Big shore batteries should be vulnerable to air attack.
That is what made them historically obsolete.
Just some ideas,