I've not tested this, but why not have a blank bar in say dominos, and have it set to change to the one you want with the modifier key (like, on my paladin, I have a bar with the normal blessings on it and if I hold shift, it pages to a bar with the greater blessings on it). It'll take up 2 action bars that you can't use as a result, but might work for what you're trying to do rather than dealing with mouseover visibility.
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