[dataweaver]

I'd take most Esoteric Skills (e.g., Enthrallment or anything with Trained By a Master as a prerequisite) out of consideration for this purpose: those are essentially “supernatural powers” systems, and no more deserve to be covered by a generic skill list than Imbuements or Spells do.

Let me second Kallatari's idea of referring to Niches as a basis for the skill list, complete with the caveat that a strict one-skill-per-Niche list isn’t ideal; but there should be at least one skill per Niche, and more than one per Niche should be the exception.