Starch can be converted to glycogen just fine, it just takes longer.
The only good reason I see to eat significant amounts of sugar is if I need an energy boost right now, ideally during exercise, though preemptive bread-eating reduces even that need. Active exercise also reduces the negative effects of eating sugar.
Might want to rethink the bread. Gluten irritates the GI tract & increases gut permeability, which can lead to inflammation & autoimmune disorders.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.