HIVE

Well, there is. Like edit the in game portrait model to fit the concept you are going for.

Sure but how does that work exactly? Don't I still have to select piece by piece to create vertex groups? For instance when you click on the sorceress' portrait model nose, the whole nose is elected. similarly with the eyes, mouth etc. But in some custom/rip models, the whole head is selected instead.

That's because the geosets of the model parts are merged together. You can merge geosets in retera matrix eater easily. Open the model, select File>Merge geoset>open same model and select the geoset into which to import(type number)>then geoset you want to import.

I hope this is what you mean.

If that program only worked.
Ujimasa uploaded a sys file but I'm not sure it's safe to add that to the OS I use.

It's working for me for years.

On wi10, it doesn't :\