Other than taking the hub adapter (See 12mm Allen socket above) completely off you could try a bearing splitter to give you some leverage.
Avail as a loaner from O'Rielly, Autozone, Advance auto.
Bearing Splitter for Cars, Trucks & SUVs
A slide hammer kit with a lockable 3-jaw puller will work but you'll have to buy one like this or Harbor Freight. They are avail for Loan but... you'll have to grind the Jaws a bit to fit the narrow groove you're dealing with.
[ame]https://www.amazon.com/OTC-4579-9-Way-Hammer-Puller/dp/B0015DMNIS/ref=sr_1_2?s=automotive&ie=UTF8&qid=1477763020&sr= 1-2&keywords=seal+puller+kit[/ame]