You're going to turn into WONDERWOMAN! There are a zillion high SF fruits and veggies. Also, with a few tricks of funky blades, you can make veggies look the shapes of things like rice/pasta.
Can you have red potatoes? I think they're lower glycemic.
Soy, obviously is high SF and low glycemic and you mentioned that it makes your tummy feel good. How about "quorn?" I don't know much about it as we don't have it available in Canada, yet. You can do tons with mushrooms.
My all time favourite pasta substitute is spaghetti squash.
I'm not sure how legumes sit with you.
I've got tons of ideas. I'm just not sure re: your tastes/food style.