Haven’t really seen any Eureka 7 and Miraculous Ladybug fanarts?
If Kaname had time to work with ppl to create the blood tablets, surely he had time to mention in passing that he had once tried researching a cure for vampires. It was because he lacked something that didn't exist that long ago, yes? But surely he would realize that eventually it probably would? He had a team of researchers and a fellow genius in Aidou. He could have resumed his research after killing the senate and the active dangerous pb's, but chose a more destructive path instead.