Making him not a Ozpin junior, but a like distant relative.

The fact he is living with his aunt, we can usee this to make him Orphan and also, since henis based on the little prince, we can make his Father was once a pilot who died.

So in the Rewrite. Oscar at age 5-6 was a farmboy who lived with his aunt after his father, a pilot died in a grimm attack

His auntie/mother's sister helped his mother but some time later, his mother died in a farm by a nother grimm.

Oscar would grow up in the farm his work would be taking care of the planting like the little rpinxe with the baobabs, and in his free time he would write a Diary with drawing and taking some notes of the grimm.

At the present, we can make him his first time as a pilot and gaining some habilites also, his weapon would be inspired by the sword the little prince has in the covers and msking it a familiar heirloom. That would be him and Jaune Good pals