@katerinafm
A lot of them will show up. I know there was one I tried which shows up elsewhere but not in JoH but I accidentally changed my merged files before I wrote it down.
I don't know if you made your merged patch after downloading the dlc or the updated modmanager, that might be a factor? My current playthrough with a human female uses Wendera's bangs and it works fine in JoH.
If you have several hairstyles available for your Inquisitor go to the BE and switch. See if they show up in Skyhold or somewhere else before testing in JoH. Also, doublecheck your settings. More than once I have had to change my settings back to Ultra after a game crash or something else happening on my PC. As a test, you might want to include elf and human hairstyles as well something that would change Harding's look. It might help narrow down which ones won't work with Jaws.
I wish I could be more helpful.