The ISA fleet list is very small, even with the new additions from 2e. The EA have quite a few ships to choose from. The fact that the EA would get the use of one of the ISA's few ships does not leave a good taste in my mouth. I would rather see the EA get their own ship than access to our Victory class.
Maybe if the EA had a shortage of ships or the ISA had quite a few, my mind could change. As it stands, with only one war choice and one armageddon choice in the ISA, I don't feel comfortable giving the EA more choices in those brackets. Even using the Allies rule, the ISA can't normally get a FAP worth of ships in the War or Armageddon range.