Adding a plate to Strider Hub when in theory it shouldn't need one seems like messy design. I would prefer to see either:
* Some kind of mechanism through which a player can directly start a strider nanoframe with an ally's Strider Hub
* Strider Hub redesigned to work more like a conventional factory, and then add a plate
Making a Caretaker which is near a Strider Hub act as an impromptu plate is... not entirely without merit as an idea, but I don't know how easy it is to implement and the UI might be an issue. Normally a Caretaker defaults to the Orders panel while a Strider Hub defaults to the Units panel.