I like this idea, it is inventive, though I do recommend you take out the green bar below any tools that already have a functioning use bar (don't forget fishing rods and bows) as your green bar would be misleading on top of the other one.
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Fare well everyone! My time to retire has come! "And with that, POW! I'm gone." ---Lord Crump
I am not aware if you have any modding skills but if you take this idea further to a mod, than we have a trading card game in Minecraft. Really good, but they do indeed look like painted wooden tablets. Still pretty fun though.