Tween needs help waking up for school

(Virginia)

My son is 12 and we just found out about his SPD. One of our major challenges is waking up for school. His school starts very early and the bus picks him up at 6:45, so its virtually impossible to start waking him up way early, especially when he had trouble getting to sleep the night before and he's exhausted. I come in and give him firm touch with gentle shaking or firm rubbing his back while talking to him. Leave, then come back a little firmer about 5 minutes later..usually several times. He avoids avoids avoids. He hides in his covers and moves to the corners of the bed. When this doesn't work and I don't go away, he starts hitting and kicking at me, then very loudly growls/grunts at me. By then it goes downhill into a meltdown of bawling and crying and the rest of the morning ANYTHING will set off the bawling again. Its so frustrating for both of us! He's too big for me to carry or move to a bath and is strong enough to hurt me with kicking. (He's fine when we don't have to get up early.) Any suggestions for an older child would be VERY welcome! Thank you!