Thanks for the quick update. It works without issues now :-)
Actually there is a way of doing this that works with every Item, goods and buffs, etc., also the new items from DLC Botanica. But is if not as confortable as the trainer.
You can use the mod loader and create a script that adds customized ships to the shipyards that already are equiped with the items you want (on both cargo and item slots) when you build them. These items are correctly recognized by the game and can be transfered to other slots, ships or buildings.