It's very nature lends itself to flexibility. I have dovetailed MIDI into my program slowly, in small ways as I have learned about it. I don't have time to learn something new. Classroom teachers used to use this same argument when computers were introduced to them. To learn MIDI technology you will need to devote some time to it, but it doesn't have to take over your life unless you want it to.
Music teachers have as much of a right to learn new skills and techniques as anyone else.
Join together with other MIDI novices and demand some learning time. A knowledgeable MIDI clinician will be able to save you time by offering tips and clear directions. It's too expensive. If you are in a cash-strapped district, this is probably true. Even if computers are being bought for the classrooms or learning centers the music classroom tends to get overlooked.