Sorry I never got back to you.
I believe this requires a Core edit (at least that is the route I took).
In ExpansionInfo.cs in the Core, note the following line:
Code:
new ExpansionInfo( 0, "None", ClientFlags.None, FeatureFlags.ExpansionNone, CharacterListFlags.ExpansionNone, 0x0000 ),
If you want to keep Expansion.None functionality, but have the server inform the client that it should be looking at new models / animatons, you will need to change the enumerations forward from .None and .ExpansionNone.
There shouldn't be any unexpected consequences, since the Server will still be running on Expansion.None.
I took this route, and everything works fine for me.
If you do not know how to edit the core, there are plenty of walkthroughs on how to compile the server.
Hope this helps.
If anyone knows how to solve this without a core edit, feel free to contribute. I couldn't find a simple way, and didn't want to spend hours attempting when a simple solution was a core edit for me.