Hello Chaps,
To make a minifigure of Hobbie Klivian and Kesin Ommis (Battle of Hoth Pilots), I used the body of any Rebel Pilot, the helmet of Y-Wing Pilot and Dack Ralter and the heads of new Hoth Rebel Soldiers and Rebel Commando.
I watched the Empire Strikes Back and I can noticed that Kesin Ommis has the same helmet of Dack Ralter and Hobbie Klivian has the same helmet of Y-Wing Pilot in this case Dutch Vander, also during the reunion with Princess Leia, you can see a pilot wearing the Red Leader Helmet (Garven Dreis).
Now we have the figure of Rogue Two Zev Senesca, so you can use the body because has more details of a Hoth Rebel Pilot.
Well I hope you can use this tip.
Best Regards.