Blue Collar Connections:
Acquire a random ship in the current port.
Everything past here uses tentative/arbitrary values and groupings.
Cost: 18 turns
"Common" Ship (Howker-Galleon) 50%
"Uncommon" Ship (L Fluyt - Brigantine) 30%
"Rare" Ship (LMM - Frigate) 15%
"Very Rare" Ship (Flag Galleon - SotL) 5%
I think it'd be interesting if these ships came from the pool of ships sold to the shipwright (downgraded to level 1/6 att), but I don't see a difference between that and creating new ones beyond the ship journal.
There could also be a second check after the rarity (or just a single rate for each ship instead of categorizing them, though that would be hard to display on the card). For example, you got a "Very Rare" draw. Instead of being 33%/33%/33%, it could be 50% FG, 30% LF, 20% SotL. That'd make the single rate for getting a FG 50% of 5%, or 2.5%. Like I said above, all these figures are more or less arbitrary and would of course need to be tweaked for fair payouts without being broken.
Maybe even a super low chance to get a MoW to get more in circulation. If any of the MoW-centric suggestions end up getting implemented, I'm sure the demand for them will rise.