All of the FCL.745.A airborne training requirement is dual and so an SEP rating is definitely NOT required.
Any organisation that claims you require SEP clearly does not understand the requirements.
To be fair, many organisations don't! I presented on UPRT at the European Airline Training Symposium in Berlin last year, and a number of organisations were still talking about delivering the 'on-aircraft' UPRT programme on Flight Sims....!