I have exactly the same problem -- guar gum allergy -- and have been fighting with Amtrak over getting ingredients lists for years now. Please contact me at ncn_mail10 (at) fastmail (dot) fm. The mods have previously asked me to take some of my discussions off the board so I would like to discuss this over email.
Where did you come up with that jewel? Although I know most of the songs by heart, I would love to get an audio copy of that recording my disc disappeared long ago (probably about the time I got married - lots of things seemed to disappear one she moved in 50 years ago.. If you have the time and inclination, you can email the files to me at email@example.com.