1 paint hair on the skin texture.
what most do.

2 shader
might as well paint on the skin texure

3 texture a lot of small hair meshes,like they make textured skull hair.
might as well use dynamics

4 dynamics
to look good will rase the polycount high.probably to high.
unless done in zBrush,mudbox or a high polycount app.

5 could paint hair in post
only works for personal use for people that can.

So now where back to paint hair on the skin texture.
That's why every one does it this way.
pretty much the only practical solutions.

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance