Although I still very much limit the screen time, my solution to this problem is DVR and DVD's. If you are looking for some preschool programs in Spanish, check out Univision on Saturday mornings. They have Pocoyo, Dora, and Go Diego Go ALL in Spanish. I record them to watch during the week and we can just fast forward through the commercials.
On Friday evenings we have implented Películas y Palomitas (Movies and Popcorn) int he playroom where Diego gets to pick a DVD and we all cuddle up to watch a movie with some popcorn. Diego will watch the entire movie but Mateo just watches for a few minutes and then goes and plays.
I snapped this picture of them watching a movie last Friday.