IMO any specialist combo choice can easily be made to work except those dropping Transmutation. (Not that tranmutationless wizards are impossible, but you better REALLY know what you are doing or you will absolutely certainly regret it.)
Stat buff spells, Knock, Fly, GMW, Haste, Slow, Dimension Door, Teleport, Poly Other, Poly Self -- these are all meaty spells that are difficult to substitute for. And the selection gets better once you reach 6th level spells.
I have played an Abjurationless wizard before. While annoying at times, I was not too bad really.
You can very easily build a combat-centric wizard without any Evocation spells. It is a simple and fun concept to play, but none of those spells are essential.