"Intermittent fasting seems like it'd wreck your body if you do moderate to intense exercise. So I just fasted, and now I want to do intense cardio.... but I might run out of glycogen or blood sugar. Or I may do a set of weight lifting, but not if I can't eat protein after. So if I do intermittent fasting, I have to come up with a complex schedule to follow in order to get any performance gains. "

That's not true. You just have to get used to it. When I did boxing I often did two hours intense workout in the evening and didn't eat anything after or hours before. No problems.