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Here's what I would do. Create a new Special for the half-fey template that is called Spell-Like abilities. In the script, you can modify the description of the spell-like ability in a script (field[CustDesc].text) and you can apply a conditional if/then/else statement that looks at the hit dice of the hero and modifies the description based on the HD advancement.
Does that help?
count:Hero.HitDice >= ##
The problem with doing it that way is it doesn't post the per day uses of each ability on the In play tab.
In your conditional, you can set the field[hTotal].value to the number of uses per day based on the HD.