Hexigon does lines?  Cool.

Well,  to make hair from scratch,  I would first start in Poser and create a scalp and dynamic hair as normal.  - don't do anything fancy, just save it into the hair room as normal.  It will be used as a place holder.  The resulting ".hr2' file will have object data for BOTH the scalp and the hair guides.  Also  it will have indentations just like a Python script and those indents have to be observed or the stuff won't work.

Next go into Hexigon,  load in a scalp model and start creating hair from scratch.

When finished, save out the hair as OBJ.   Use that OBJ text file as a source to "splice" your object into the Dynamic hair  "place holder"  you created in Poser.  It should completely replace the existing Hair data in the ".hr2' file - be sure to observe the indentations - the OBJ you just output from Hexigon may not have them.  - The Find&Replace function in your text editor is your friend.

Once you have a hair object in a modeling program you can do almost anything,  like make Bagginsbill's spikey hair by tapering the guide hairs, or create braids,  pull hair into a bun,  hold it with bobby-pins,  and make your favourite anime character.

the sky's the limit.

hmmmm,  might have to make a tutorial.....

later all