Thank you both for the information. I finally had luck with creating the MPEG2 stream. Not entirely sure what I was doing wrong before.
As for MPEG4, I opted to get QuickTime Pro, because that seems to be the most assured way that a “hinting track” can be added, while also converting to MPEG4. This has solved my problem and Arbil is accepting these files.
To answer your note, this is currently an unarchived project. However, I am in the field trip stages of a project to work on the grammar of this language. For that reason, I would like to get the workflow and constraints all dealt with early on.