Diego Rossi
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As a GM I would give you a +5 to the DC for missing a prerequisite or better require you to have someone with the skill helping in the item construction.
I would even bar some skill for being purchased. Having a headband grant you 20 skills in linguistic and 20 languages when it is made using the knowledge of 1 language would be a bit excessive.
Maybe requiring to add Comprehend languages to the list of requisite for crafting the headband would make that more palatable but it is still problematic. I greatly prefer the approach where it is treated as an increase in intelligence, so you get extra skill points that you must allocate in a permanent way.