While I am finding the problem why I can not make a build template shortcut for Factories that works, I think about if it is possible to make an icon like there is already one for the build template.
Please correct me if there is somewhere an icon, but i doubt so.
so here it is in a graphical way of explanation:
this functionality for structures
could be at this old menu
in this way:
The hover text would make sure that this is the build template for factories.
What do you think? Usable?
By the way, is the shortcut for factory build templates working for you?