Actually who knows, maybe its a possability, considering with new community manager we got some things moving, like updated anti-cheat and proper beta test version.
Its not like Relic will be requared to work on models, all they need to do is just generally allow them to be made (in at least ported from vCOH). They just need to provide tools for either 3Ds Max\Blender\Maya and agree to upload them later into the game build.
And as I said somewhere, its not like they need to allow moding for general public. At least allow community working on updates to bring new things and then just add it to the game.
Nothing else is really needed except Relic allowing model importing and editing as you can see here:
Everything else you just mentioned is possible otherwise.
Relic Entertainment
cblanco ★ 
보드카 중대 
VonManteuffel 
Heartless Jäger 
