Flour Tortillas? good soluble fibre
Quinoa? ancient wheat grain, easier to digest than modern wheat - can buy and use like rice or there's cereal made from it at Tesco - try organic section
Corn Meal? aka polenta - soluble fibre. Use to make pancakes, cook in water and have with accompaniments (like mash) or cool when cooked, slice up and toast
Yams? bit like sweet potatoes, in fresh veg. department
Rutabagas? never very sure on this, don't think we get them here in the UK
Beets? beetroot, buy them uncooked in the veg. dept., roast in their skins then eat or puree. Like the ones in jars without the vinegar!
Papayas - fruit, ok if you can tolerate fruit. Peel it!
Other things you mentioned - baked beans are more insoluble fibre because of the skins, you could puree them if wanted.
Tuna is ok, with a bit of lowfat mayo if tolerated. We don't seem to have fatfree mayo here.
Jacket potato - great, avoid the skin if necessary - again, insoluble
Looking for inspiration...