MPEG-2 with audio but no transport stream?

We have a Leightronix Nexus, which is a new whizbang digital video playback device for cable studios. It supports transfer of MPEG-2 files, but thus far I haven't been able to make a compatible MPEG-2 file with Compressor. Leightronix only does Windows so they've been of no help.
Here are the requirements as listed in the Nexus manual:
-MPEG-2 Program Stream, consisting of a single elementary video stream with an optional single elementary audio stream. In big letters it says "Transport stream is not possible."
The other specs seem fine; I think it's the lack of a transport stream that fouls it up. Compressor, in the audio checkbox, says "Select this to create an MPEG-2 Transport stream with multiplexed audio."
Is there a way to get audio into an MPEG-2 file without using a transport stream? If Compressor can't do this, are there any other (hopefully inexpensive) tools that can?
One interesting thing is if I copy one of the mpeg-2 files created on the Nexus itself (by having it digitize video), it plays quite fine in Quicktime Player.
Any help is appreciated. Thanks.

Or, you can just use a freeware tool like MPEG Streamclip to combine Compressor's elementary .m2v output with its .AIFF audio and produce a multiplexed program stream. The $10 MPEG2 Works shareware app will also do the same (along with several other operations).

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