Need to transfer 480i to blu ray for theatrical
 

I have a theatrical for a film shot 20 years ago 1:33 on color neg. I have the 1" transfer made at the time, and the a/b negative reels. Obviously best route would be to scan the neg to 2k and re-grade,but it's not worth it for one showing. Any thoughts on using other methods to uprez the 480i?