and leveling up you can have access to your allies ships up to T5, where you can only use lockbox ships, lobi store ships, and Romulan ships.
Not true. A Romulan has access to any of their allied faction's T5 ships that are account unlocks. If you're a fed-rom and you have the Odyssey or Armitage, you'll be able to use them. Though why you'd want to when you have access to the sexy D'deridex is beyond me.