I had posted this in a post, but thought I would place it here as well for other modders.
Tools
BCRY Blender plugin.
https://github.com/LuneMods/Cryengine-Converter/releases/tag/release
KCD2-cfg-convertor
https://github.com/LuneMods/Cryengine-Converter/releases/tag/release
KDC-pak-builder
https://github.com/Antstar609/KCD-Mod-Packer
RC.exe (I got from the nexus site below, but on discord someone shared it with google drive.  I listed both just in case you want the full tools instead of just the rc.
https://www.nexusmods.com/kingdomcomedeliverance/mods/864/?tab=files
https://drive.google.com/file/d/1NPzuAQh0hY_lce5f8rw1t99mppmozWX9/view

Process goes like this:
1) unpack pak file like IPL_Characters-part1.pak (just unzip it)
2) find a skin file like: "IPL_Characters-part1\Objects\characters\humans\female\clothing\f_torso\f_dress\f_simpledress\f_simpledress02_torso\f_simpledress02_torso.skin"
3) Use the convertor above to get it into dae format.  I just drag the skin onto the exe.
4) Import into blender using Collada (dae).  It's the first choice for me in blender.
5) Mess with the mesh!
6) In the configuration set the rc file location.  (see photo below)  Only need to set rc.exe location once.
7) Add Export (at the top) and then Export at the bottlom and it will be a skin file.
8) Package using the Mod-Packer - make sure you keep the paths.  See this mod for folder structure or just ask me.
9) test in game.
10) Ask me any questions, happy to help.