which version of Distiller are you using?
As I understand it, the "Output Intent Profile Name" shouldn't mess up color management downstream unless someone chooses to print from Acrobat and specifically uses it in a deliberate profile to profile conversion.
I'm not sure if the profile is actually embedded or just referenced as a URL.
One potential problem is that you can
choose to color manage cmyk to cmyk in Distiller during pdf creation. It's just that the options are a bit clearer with v7 and v8 compared to v6.
Sorry I can't be as cast iron positive as Robert would be about this
Surely as a newsprint type quality, wouldn't a correct PDFX output intent look terrible on screen for your clients?
... there was the puzzle of why the sun came out during the day, instead of at night when the light would come in useful.