Should be doable. Wizards without spells are pretty mediocre, but they probably wouldn't play that much differently from, say, a thief. Probably best bet is just to close the gate as usual, then pick up the wish book from the library (or do you get wish at level 50? I don't remember). I don't know how much scumming is required to cast 1500 PPs... at level 50 you're probably pretty close. Otherwise, scum the BDC for wands to mana battery, I guess.
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.