Is there a crop available for 4K 2.39:1?

I'm working on original files which are 4096x2160 (4K DCP) but you need to view it in 4096x1716 to get the projected AR.

The built-in widescreen filter doesn't offer a 2.39:1 crop, and even then it doesn't work properly due to the way the master file is formatted (I tried 2.35:1) but it seems to massively overcrop the image.

Any suggestions?