I think you could do Einstein hair easily
in the P5 hair room.

I think that may be the first time I've seen the word easily and the phrase P5 hair room used in the same sentence. (I tend to pull my own hair out over the hair room a lot, don't mind me...)

This might be a stretch, but at Leflic's 3D Mesh there's an Einstein-like character in LWO format. You might be able to cut the hair out as a separate prop, then adjust it to suit. I got the link to that web site from 3D Links, which has a list of lots of web sites with 3D models free for personal use.

Hope that's helpful,
Jack