This isn't really intended to be a retrofit discussion.
I personally would like a small cruiser at the tier 5, something like the Excalibur. It seems to be one of STO's flagship's as it was on most of the boxes. This also could be adapted to the Akira class, as I have a new 'special' slant for it.
This ship sacrifices weapon slots for extra BO powers essentially. You loose 1 off the front and rear, gain 1 extra BO slot. The LTC universal would let the owner select whatever specialization he or she wants, then you get a Lieutenant BO set in all three The engineering slot is a commander as the example is a cruiser.
Special Ablity: Multiphasic Shielding Small Shield Heal and Buff/Small power level buff
350 Shield Regeneration applied once to each facing
+15% Shield Power Level over 20 seconds
+50% All Damage Resistance to Shields for 20 seconds
Immunity to Tractor Beam and Boarding Party for 20 Seconds
Cooldown: 5 minutes