This is the result of an experiment I did a few days back. I think it's worth sharing.
Stock eyelashes look quite weird with the default Cycles shader generated on MHX2 import. Especially specularity is completely wrong. Good news: It's easy to fix.
This is the node setup:
The important part is to use the alpha channel of the stock texture for displacement. I used "eyelashes04", but this might work with other eyelashes as well. It might be worth trying to use this approach for eyebrows, too.