Jonathan,
Your goals are noble and you seek to do right. Well done.
Having been a 7th Grade Bible teacher, I can attest to how difficult it is to keep students "attentive". I designed my class to be stretching for the students (short papers, debates, exams, class presentations) and I knew going into the year, that it would be difficult for them. While my class was busy digging into Scripture, writing papers, and having great discussion in class, the other 7th Grade Bible classes were doing more "entertaining" practices (i.e., instead of discussing Jonah in redemptive history as we did, they watched the Veggie Tale Jonah

). [One caveat, I did use some videos when discussing historical background...therefore, I am not opposed to video as a teaching tool, but we must be guarded in its use. Yes, there can be too much of a good thing]
Not surprising, I received complaints about class difficulty (along with the usual student groaning about work) and many days the students would ask, "why can't we do X like the other classes." Everyday I told them that we would not do such things because Scripture was supremely important. Everyday I sought to show them the grand drama of Redemptive History and instill in them a love for God's word.
To be sure, there were days that I almost acquiesced because it did not seem I was winning the battle. However, the next year I heard from the 8th Grade teacher and he stated that he was thrilled to have students who had worked hard and were accustomed to dealing with Scripture. They were holding their own and were excelling. Even the ones who seemed the most distracted had gained from the class. (Here I thought I had completely lost some of them to inattentiveness, yet despite their constant distractions, they still heard Scripture and it bore fruit later on)
I do not say this to toot my horn, but I give this story as a way to exhort you to let your excitement about the Word show itself to the students; pass it on to them! Show them the deep rewards gained from diligent study of the Word instead of a quick fix of entertainment. I would abandon the use of movies for object lessons and train them to rely upon the conjunction of prayer and God's word for understanding. This is a pivotal and vital connection to understand in Christian piety. The practice of video clips for illustrations when understanding is lacking may unintentionally bifurcate this connection.
May the Lord grant you creative wisdom in teaching these students.
Sincerely,