YES!!!!!!!!!!!!!!!!!!!!!!
Him being Vergil's humanity is a waste of a good idea. Ironically Nero being a younger Dante would feel more believable. V and Nero have the opposite problem (he feels too reminiscent of Dante while V felt too little of Vergil at first).
PS. I'm biased- V rules Nero drools- NO REGRETS!!!!!!!
Outside of a flashback, he's just gonna pop up as Vergil's conscious or an alter living in his head with Urizen.
Right now I'd settle for a Summoner style in a future Vergil game and Visions of V starts being more daring with its material. Or a DLC where V wanders around during the month in between the first two levels and stumbles upon a place Vergil visited.
There's always an alternate universe but that feels too much like a cheat.
:banghead::banghead::banghead::banghead::banghead::banghead::frown::frown::frown::frown::frown::frown: