I just now had an idea for a new quest type.
Right now each trader spawns with all the "crafting helpers" (forge, workbench, cement mixer, chem station) but with some chance of them being destroyed.
So, I propose "fixer upper" quests. Let's say the trader's workbench is broken. The trader gives the player a quest to gather or loot all the items one would need in order to build the workbench, even if the player is not at a level to make one themselves.
The quest reward would be the fact that the workbench at the trader is functional and usable.
If TFP wanted to be consistent, they could have all of the "crafting helpers" be destroyed initially, and only able to be repaired using these quests.
I think TFP would have to implement this themselves, because I don't think it is possible to "repair" a trader's workbench through modding. But perhaps there is a way that I don't know about.