I found that if you rip your disc with DVD2Xbox using the ISO ripper mode, the dump can be used with Repackinator. There are a few steps in the middle but it works great!
Technically, you can create any kind of file you like once it is in a format Repackinator will accept. Just keep in mind that scrubbed CCI is the smallest file we can get that still known to work with title updates, DLC, and Insignia.