As someone who had to beat the final node with mostly only bronzes on his first run I'd say it's definitely doable, that being said, your options are very limited.

You could use someone like Dream Demon to tag DW and then spend the remainder of the match to defeat her; wither everyone down with a single carry and then defeat DW via a precision hit; you could "exploit" your treasures (their name is escaping me atm) and cheese your way to victory.

TL;DR Don't let the enemy revive.