People with same ID have the ships they should use listed as RP. Meaning you can use them without asking anyone.
Ships from other factions than your own are yellow and require asking, for example if your LWB wants to use Odin you should ask Red Hessian faction about it. Or write a story how you got it from Hessians and why you are using it.
Or, how about this, just fly the ship that actually makes sense for the character!
I know it's a novel concept here, but isn't a worth a try?
Why do you need to fly another factions ship? You can't RP without it? Too often it's simply a justification, a quick rp to give you a pvp advantage, and even if it is not, it seems that way.
Also, the factions here are mixed, a guy could be in both factions, so he's asking himself if he could fly the ship.
What's wrong with being fair across the board, simply having a list of allowed ships for each ID?