Hi Neckhammer - we meet again!
Poppi, I don't have autistic kids, but I do have one seriously super-taster youngest, one who cannot tolerate artificial colors or preservatives or additives same as me, one dairy-allergic celiac, and one with a huge diagnosed sensory disorder along with being developmentally delayed who is SCD with Primal tweaks.
Neckhammer is right - for right now, they willingly eat regularly, do have most of the food groups in there, and get the calories to grow. Let it be enough for right now while you decide which food project to take on next. You have complex cases there in your kiddos - there simply is no way to get it ALL done quickly. This a process, and it will take time. Cut yourself some slack - many, many moms simply wouldn't take the time or the trouble - you do/are, and you will get there.
If you want your kids off of g/f noodles NOW, try the all-rice varieties from an Asian grocer. Yeah, they are rice, but rice gets accepted around here. Might be a good next step.
Re the vegetable thing - they weren't eating them anyway, so that is no diff from before. A lot of kids get started with skinny carrot sticks with a dip - how about a homemade bacon ranch dip?? The youngest does bacon and yogurt...
And chicken - my super-picky started eating chicken when I served her a local free-range brand and roasted it extra well. She hates Tyson... And try a really crispy-skinned duck - same kid almost physically fought with another sibling in order to have the most duck.
I have a mantra that I have spouted for years... "If I eat right, I feel right. If I feel right, I exercise right. If I exercise right, I think right. If I think right, I eat right..." Phil-SC