I can answer my own question (the 2nd one)
I tried replacing Morrigan's hair with a morph i downloaded a while back
with hair #1 it worked perfectly
with hair #2 her face became completely black
1. J1nX provided a .jpg in the download that has pictures of the vanilla hairstyles with all their corresponding file names. I had to zoom in pretty close to see the numbers, but they are there. Just look for Leliana and Wynne's hairstyles to find their file name.
2. hf001 did not conflict with Morrigan's face morph for me. So, I imagine that it would be fine with others as well.
to the end of the <morph_config><hairs><human_female> part of the chargenmorphcfg.xml in your override directory. If you don't have the file in your override just download some other mod that has it with it or open the toolset, go File -> Open -> Dragon Age -> packages -> core -> data -> misc.erf. Then right click and Extract Resource on chargenmorph.xml. Put the chargen file in your override directory. If you added them at the end, you should now get the hairstyles as the last selection of the hair in the chargen.