Dear Shlomo,
Paul Sharp, who is moderating the Meditation course group, and is a key figure in the coming Ngondro-course as well, has this reply to your question:
“Yes to do both together is great. But make sure to also leave enough time to do the shamata meditation aside from the ngondro practices. If one hasn’t started the ngondro, it is best to the meditation course without ngondro and start the ngondro later. But if one has already started a daily ngondro practice then integrating is great”