Not sure if it's what you're looking for, but if you go to Fleisch's Mods
he has a database named Smackdown vs. RAW.
This mod basically has WWE split up into 5 separate promotions (RAW, Smackdown, NXT
, NXT UK and WWE Evolution (I presume for the women but I haven't actually tried the mod so I'm unsure).
You can play as NXT in this mod, otherwise wait until 2020 and you can play as NXT as a proper developmental brand.