Ok well, most resturants that cater to vegs pride themselves on friendliness, so I would simply order a huge amount of veggies, stir fried in one of their thai sauces. I am sure they would be more than happy to indulge you, they know how inconvenient eating out can be when you have a restrictive diet. Just tell them starches dont agree with you well.
Maybe try some of the soy meat stuff on the side, because your friend wants you to try it.
Just because you want the dish slightly different from the menu, doesnt mean you cant have it. They will usually be glad to comply.