And the second issue - if this theory was true - and by manipulating blood glucose levels you could achieve far greater willpower whenever you wanted
Logical error: (diminished X correlated with diminished Y) does not imply (increased X causes increased Y).
Among other things, there could be some other variable Z that causes both X and Y to diminish.
There can also be more than one resource bottleneck in the process - if other resources normally take longer to exhaust than glucose, all this does is make you run into problems later.
There may also be non-resource bottlenecks, like how much "executive" wiring you have. See the meditation-grows-your-brain studies, that seem to indicate willpower is like a muscle in terms of being able to be grown and made more efficient. So, removing the glucose bottleneck without increasing executive control, could be like having a fed runner who hasn't run a marathon before. You can give them all the glucose you want, but that won't necessarily get them to the finish line.
Following the logic of constraints, one can generate an almost unlimited number of plausible scenarios under which glucose will not produce any substantial improvements, even if glucose were a bottleneck resource in akrasia most of the time.... which it probably isn't.
Logical error: ...
You seem to have not read the linked research - consumption of sugary drink restores willpower in laboratory setting, and not one word you said makes any sense in light of this.
There's considerable amount of evidence that willpower is severely diminished if blood glucose get down, and this effect is not limited to humans. And a small sugary drink at the right time is enough to restore it.
We're talking really small numbers. Total blood glucose of a healthy adult is about 5g and it varies within fairly limited range. Then there's maybe 45g in total body waters. Then there's about 100g of glycogen in liver, plus yet larger amount in muscles and other organs, but which doesn't seem to take part in sugar level regulation. For comparison a small can of coke contains 33g - a really small amounts at appropriate times can make a big difference.
This leads to two issues. First, is blood glucose a good explanation for willpower deficiency and therefore akrasia? I'd say there's significant amount of evidence that some effect exists, but is it really the most important factor? Humans are complicated, science knows very little about how we work, and probably half of what it "knows" is false or at best only half-true. Caution is definitely warranted.
And the second issue - if this theory was true - and by manipulating blood glucose levels you could achieve far greater willpower whenever you wanted, what would you do? It seems that exploiting it isn't that easy, and I'd love to hear if any of you tried it before.