It’s almost 10 years, they could become available to the wider audience. The Gnosis was also given away for free after several years of being a one-time event ship.
If you don’t want to flood the market, make it difficult to obtain: let’s say you need +8 standing with the given pirate faction, and requesting their corvette will make you lose 1 whole standing point. Sounds like a fair deal to me.
New Concord corvette? Or one for Edencom maybe?
Also SoE, SoCT, Mordu’s Legion and the Triglavians still need a corvette with preferably a unique design.
Maybe even ORE could get one, just for fun.