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A 3rd party product should just combine heighten and fortify into a single metamagic. I think Arcana Unearthed is supposed to condense the sprawl of metamagic and item creation feats.
Of course, the odds of a spellcaster getting a critical hit with a ranged attack are much lower than the odds of that same caster missin, and thereby comepletely wasting that 9th level slot.