Yes you can. Speedlight C and D model gates have an external socket that lets you daisy chain your old wired Speedlight gates just as you have been used to. Look at the bottom of the device menu on right hand side of the 'Test Designer' page.
Tap the little '+' at the bottom, and their you will see your old faithful wired gate.
Make sure you drag one Speedlight gate onto the page first, and watch them connect automatically in the test designer.