Don,
I would have to defer to Eric. I get my amino acids from quinoa and looking at jumping to kamut. I would not suggest you even try swallowing either of those. I don't think anything good would come out of that.
As far as sipping I would consider what Cheryl said about Stevia instead of maltodextrin. You would get the sweetener plus phytonutrients. The down side is you would have to find more calories. Have you considered any nut butters? Almond butter would be a good one. Some good fat, protein and calories.
I also use Green Stuff. Phytonutrients, veggies, spirulina, chlorella, etc. It has a moderate level or ORAC units @ 10,000/serving. I have read several articles over the years suggesting antioxidants should be avoided during chemo and radiation as high levels may interfere with both.
I personally get my blood checked every 2-3 months and adjust my diet to address any abnormalities. I believe our bodies respond better to nutrition from foods. Just my opinion and certainly understandable why that doesn't workf for everyone especially with compromised swallowing.
I also think corn was used to trick the White Man by the Native Americans.

No matter what the industry says, HFCS is the single worst thing ever introduced into food. Studies are just showing how bad it is. It changes the brain chemistry and creates more hunger or craving for more sugar and as Eric pointed out above, sugar does not help much of anything and rather harms us in many ways.
Ed