3DXchange has individual normal flipping. See here:
https://manual.reallusion.com/3DXchange_7/ENU/Default.htm#3DXchange_7/Pipeline_7.0/04_Modify_Page/Normal_Section/The_Concept_Of_Normal.htm%3FTocPath%3DSection%2520Details%2520in%2520Modify%2520Page%7CNormal%2520Section%7C_____1

https://manual.reallusion.com/3DXchange_7/ENU/Default.htm#3DXchange_7/Pipeline_7.0/04_Modify_Page/Normal_Section/Flipping_The_Normal.htm%3FTocPath%3DSection%2520Details%2520in%2520Modify%2520Page%7CNormal%2520Section%7C_____3

Oh, and one more (I keep forgetting about this one :)). You can bring back cloth only as an accessory and then transfer weight paint by selecting  the same saved cloth item with weight paint in Transfer Weight Paint applet.

@Rampa
You can do this in CC too (almost). But unfortunately with object only. Yes 3DX has an option to select a mesh, but not individual faces, where sometimes only a few faces are imported flipped for the object/mesh as a result of developer or others negligence.

"transfer weight paint by selecting  the same saved cloth item with weight paint in Transfer Weight Paint applet"
Genius! I'd never spotted that applet. That's got to be the best option. Thanks again

                                    

Unity Virtual Reality Developer