Is there a way to modify a unit's tech tree requirements? I've been looking all for the data editor and I couldnt find anything that could help.
None.
I do stuff and thingies... Try widening and reducing the number of small nooks and crannies to correct the problem.
You can add a requirement to an ability. The Ability you would like to modify is each worker's one to build/construct.
You can edit or create new requirements in the requirements tab in the data editor.