Converting NPC overhaul mods from LE to SE?

[Mud]

There are quite a lot of standalone LE NPC/follower beauty mods which use assets from other mods to create their face files, and thus are unable to have their facegen files properly generated by the CK. I was wondering if there was a process to successfully convert these over to SE, since I assume the SE CK is similarly unable to generate their faces. Would it work to simply resave their ESP files as form 44, and then manually replace their facegen meshes with their old ones, running them through the NIF optimizer program if necessary?