Not to blow my own trumpet but i did an all white sniper Zero a while back and made it to the 2nd level of the peak so it is possible. By that time enemy health re-gen was out doing damage and i just had to give up as i kept running out of ammo.
I used a set of Rackell’s and Sniders in all elements, white turtle shield, survivor com, slag transfusion and a Tesla if low on ammo for shields, relic was generally sniper damage and ammo capacity.
I have many many days on this VH as i had to play far more carefully than normal, but with only about 170hp it was survivable but i didn’t put out a lot of damage in late UVHM. Choosing which enemy was to take priority was the main stay so you had second winds available, but dying was a regular thing i wont lie about that.
It was very challenging, frustrating and there were many many times i wondered why i was even bothering with it, but as a stubborn a**hole i wasn’t willing to just give up and wanted just to get to 72 and beat it, having started in NVHM.
Almost every shot had to be late out of Deception to max the damage and conserve ammo, even to the point of making sure you didn’t pick up ammo before you got low enough to make sure you kept it replenished.
It was fun but rewarding, but never again, not with sniper Zero anyway … although Maya and Cloud Kill would stand a very good chance and i’ll admit i am very tempted, but i am doing a white and green only playthrough at the moment with her so that will be easier that’s for sure.
And no i didn’t use BAR as i just did a post asking that and still don’t, … probably silly but i’m set in my ways.
I have seen guys like MoLmF do all white runs i think, and i would think someone with a skillset of his calibre would be able to do it and a lot better than i managed that’s for sure. So in saying that yes it can be done and i’d be very surprised if i was the only one that’s for sure.
I also have a nurse build for Maya, but with a set of Pimp’s and a Twister using a green turtle shield and nurse com she could swap the Quasar for any singularity grenade, blue or purple com and relic and do this rather easily i would think, but that would be a little unfair given the standard of those weapons.
Hope that helps.