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How often does CV really screw over a jungler? I mean really? Most of the time I have seen it used the only thing revealed was an empty section of map. The reason most people choose to use Flash is because what other choice do they have? A spell that buffs towers? Doesn't do much good unless you're under your turret. Why use cleanse to remove a debuff when you can pick flash and get more utility out of your choice. Heal works early game but towards the end it's not that useful.
How about you just buff and modify the other spells, like you've planned and see if that fixes your problem before nerfing the ones that work?