How do we get Tech-K to work with other modes (such as Future Wars) as described in the documentation?

I'm trying to figure out how to play with both Future Wars and Tech-K modes enabled. The update notes that introduced Tech-K to us says "Tech-K can be enabled in any game type via the Experimental tab in battle options". Yet whenever I start a game with the Future Wars mode enabled, the Constructor ability to level up factories from Tech-K is not there.

So I must be doing something wrong here, but as of yet I am unsure what that could be. Thank you for your time.