Comment 3 for bug 1800812

I think that starting an expedition is already expensive enough and the additional wares should not be added by default.

3) Sounds the way to do it during port construction. The ship is not forced to stay, so with 1) it could wander off if there is a second port. 2) is too limiting for a new starting condition.

As to getting the additional wares on the ship, that should be defined in the start conditions. There should be a function prefilled_ship that does the same as prefilled_building, only for ships, then set that ship into expedition mode.