I would say yes to the healing hex since the only requirement on the feat is to target a creature and then another creature within 30' is effected as well.
The disguise hex although doesn't target a creature it is just something about the witch that happens like child scent.
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Could you use Split Hex to put a Ward Hex on two targets?
This is what I have been wondering myself as my witch is getting close to 11th level. I will ask my GM but by RAW it is kind of wishy washy
Ward (Su): A witch can use this hex to place a protective ward over one creature. The warded creature receives a +2 deflection bonus to AC and a +2 resistance bonus on saving throws. This ward lasts until the warded creature is hit or fails a saving throw. A witch knows when a warded creature is no longer protected. A witch can have only one ward active at a time. If the witch uses this ability again, the previous ward immediately ends. A witch cannot use this ability on herself. At 8th level and 16th level, the bonuses provided by this ward increase by +1.
Although Split Hex might make it work:
Benefit: When you use one of your hexes (not a major hex or a grand hex) that targets a single creature, you can choose another creature within 30 feet of the first target to also be targeted by the hex.