Yes! You can upgrade your non-drive side (left side) powermeter to a dual by purchasing a factory install for the drive side (right side) only. We do not need you to send in the non-drive side to install the new powermeter however, the chainrings must be sent.
If your intent is to upgrade in the future, you will first want to check compatibility prior to purchasing to ensure we offer the drive side install on your specific crank: Crank Compatibility Finder