I have installed customer owned modems before when working during college registrations. The student purchased them at book store, called twc, and gave them the mac prior to the install appointment. So if eMTA was like every other model installed in your respective market, I dont see why it couldn't happen. A modem is a modem. An eMTA is an eMTA.
This is CABL.com posting #339941. Tiny Link: cabl.co/mbAA5